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800.979.0122

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1978-Up GM Metric Brake Calipers, IMCA Approved

Specs
Centerline of Holes:
5.50
Material Type:
Steel
Color:
Gray
Sold in Quantity:
Each
Finish:
Natural
Piston Diameter:
2.38
Caliper Pistons:
Single
MFG. Part #:
-
Garage Sale:
No
1978-Up GM Metric Brake Calipers, IMCA Approved
Product Video
1978-Up GM Metric Brake Calipers, IMCA Approved

Click image to enlarge



Details

Reviews

Q & A

What's in the Box

These stock replacement single piston Metric calipers were standard equipment on 1978-88 GM mid-size cars (Cutlass, Grand Prix, Regals, Monte Carlo, etc.). They feature a 2.38" single piston, shielded bottom inlet, and will save 3-1/2 lbs. per side compared to mid-size 1969-1977 caliper.

 

  • IMCA approved
  • No core charge required
  • 7/16"-20 inlet
  • Can be used with brake hoses from Pre-1978 GM intermediate cars
  • Brake pads & bolts sold separately

 

Note: Does NOT include brake pads or slider bolts and bushings.

Item Details

7/16"-20 Inlet
5 1/2" mount spacing

Customer Reviews

Rated 3.6 out of 5 by 5 reviewers.
RATING BREAKDOWN
5 reviews
5 Stars
1
4 Stars
2
3 Stars
1
2 Stars
1
1 Star
0
RECOMMEND THIS PRODUCT:

54
Verified Purchaser
Minnesota

bolted right up, great value

May 11, 2015
Make sure you buy new 7/16-20 fittings as the caliper you are replacing might be different!
Pros:
  • Inexpensive
  • Seems To Be Working Just
Yes, I recommend this product.
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Was this review helpful? 0 0

garybob
Verified Purchaser
Pocahontas, IL

The calipers are a great re-production o

August 11, 2014
The 1978 GM Calipers were purchased as a replacement for the Mustang II calipers and rotors. I suspected there may be a clearance issue since I was using 14" Steel Painted Wheels with trim rings and hub caps. The wheels contacted the calipers on the very top of the caliper, nearest the inside of the wheel. A grinder and a few passes achieved the needed clearance. 15" Steel Wheels would clear without an issue. Still very pleased with the 11" rotors and calipers over the Mustang II nine inch rotors. I can now stop the truck.
Yes, I recommend this product.
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Was this review helpful? 0 0

Troy663
Verified Purchaser
Chicago, IL, USA

Had one flaw

April 30, 2014
My right side caliper piston is leaking a lot of fluid and I will have to replace it.other than that it's a great product that I would recommend and have been recommended to use. This is the first problem I've ever had with speedway products
Pros:
  • Easy To Install
Cons:
  • piston seal broke
Yes, I recommend this product.
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Was this review helpful? 0 0

Merchant Response:

Speedway Motors customer service team has issued this customer a credit for a replacement caliper. We apologize for any inconvenience this has caused.
Grumpy G
Verified Purchaser
Harrah ,OK

good solid product

May 07, 2011
the good thing about these caliper's is the slide bolt set-up. the bad thing is i ordered them to fit a Ford rotor and they are a quarter of an inch to wide, so i had to build a block spacer to take up the gap.
Pros:
  • Easy To Install
Yes, I recommend this product.
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Was this review helpful? 0 0

Mike the "T Bucket Head"
Florence, MS.

MODIFICATIONS REQUIRED

October 21, 2010
Got these for a "T" bucket front axle and had to grind off tabs on bottom to clear front axle. Also had to file the inside of the through bolt mounts to get clearance on brake shoes. Some modifications required to make work but, once they were modified they work great.
Pros:
  • Good Fit
  • Bolt alignment good
  • Good castings
Yes, I recommend this product.
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Page 1 of 1

Product Q&A

9 questions : 9 answers

1 answers

what spacer what pad spacer do you sell that will fit this caliper?

87stang
January 27, 2015

what spacer what pad spacer do you sell that will fit this caliper?

Answers

January 29, 2015
EricM
Brake pad spacers 91041908 fit this caliper.
1 answers

Correct installation of brake pads I purchased a Mustang II IFS that came with these brakes. How are the pads installed? There are two small shims that came with the pads and I'm not sure where they go. The outside pad is loose.

Hulajoe
Hawaii
May 01, 2014

Correct installation of brake pads I purchased a Mustang II IFS that came with these brakes. How are the pads installed? There are two small shims that came with the pads and I'm not sure where they go. The outside pad is loose.

Answers

May 01, 2014
EricM
The shims will be placed between the inner pad and the caliper if there is room for it to fit. If there is not enough room for the shim to fit then your application doesn't require the shim. The outer pad will be loose until pressure is applied with the brake pedal.
1 answers

Are these the low drag type? I have a set of stock s-10 calipers on the rear of my jeeps Dana60. I found out they are the low drag type which needs a quick take up master cylinder. which i can't use. I don't want to go thru the hassle of setting up the brackets all over again for different calipers.

Dingo509
Yakima, wa
September 22, 2013

Are these the low drag type? I have a set of stock s-10 calipers on the rear of my jeeps Dana60. I found out they are the low drag type which needs a quick take up master cylinder. which i can't use. I don't want to go thru the hassle of setting up the brackets all over again for different calipers.

Answers

September 23, 2013
Jason
GM calipers are typically NOT low drag calipers. A low drag caliper actually pulls the pads away from the rotor when pressure is released from the master cylinder. These GM metric brake calipers are not low drag.
1 answers

what type rotor can I use if I use the caliper mount and the calpers on a 9'' ford

shortstop
east tx
December 06, 2011

what type rotor can I use if I use the caliper mount and the calpers on a 9'' ford

Answers

December 07, 2011
Zach
Speedway part number 91031045. These calipers are what is included in our 9" Ford bolt on brake kit part number 91031902. We can sell you the rotors seperately if you like, they are part number 91031039. If you would like to place an order please call 800-979-0122.
1 answers

What size and thread profile are the bleed valve?

May 09, 2011

What size and thread profile are the bleed valve?

Answers

May 11, 2011
Jason
The bleeder's are 10mm-1.5 thread.
1 answers

What should the master cylinder bore be to go along with these calipers?

David
Manteca, CA
February 15, 2011

What should the master cylinder bore be to go along with these calipers?

Answers

February 17, 2011
Waymon
The 1978-88 GM Metric Caliper, Item # 91031045 or the 1978-88 GM Metric Caliper, Item # 91031047, will need a one inch master cylinder. We suggest one of these three master cylinders : ALUMINUM MASTER CYLINDER Item #: 91031422 Chrome 1" Bore Master Cylinder Item #: 91031446 Deluxe Aluminum Master Cylinder, Chrome Item #: 91031455
1 answers

will these calipers clear a 11.75 x 1.25 thick rotor thanks

bammer
gadsden, alabama
January 12, 2011

will these calipers clear a 11.75 x 1.25 thick rotor thanks

Answers

January 19, 2011
Craig
That caliper part # 91031045 is made to fit a 1" thick rotor.
1 answers

Can the synthetic brake fluid dot 3 be ok to run in these calipers ?

headbanger
Amarillo tx
May 26, 2015

Can the synthetic brake fluid dot 3 be ok to run in these calipers ?

Answers

May 28, 2015
Eric
Expert
Yes any DOT 3 or DOT 4 brake fluid is compatible with these calipers. Do not use DOT 5 fluid with these calipers.
1 answers

Do these caliper use a standard GM metric sized pad

Bill
June 25, 2015

Do these caliper use a standard GM metric sized pad

Answers

June 26, 2015
Eric
Expert
Yes these calipers use standard GM metric brake pads.
Page 1 of 1

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Wilwood 150-8936K D154 PolyMatrix BP-10 Brake Pad Set, GM Metric
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Speedway Motors is your one-stop shop for GM 1978-Up Midsize caliper brake pads.

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Brake Pad Brochure (PDF)

Tech Tip:  Only use full metallic pads on coated rotors.

Tech Tip: You can fine tune your car's brake system by selecting different compounds for the front and rear, or side to side. 

Sold as a set of 4, 1 set will be needed to outfit 2 calipers.

Brake Pad Brand Guide (Link) 

Learn how to properly Bed-In your brake pads by reading our tech article.  Bedding-In Brake Pad Procedure.

DOT Braided Stainless Brake Hoses, 1978-88 GM, 10mm-1.5
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1978-88 Replacement GM Midsize Metric Calipers
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These stock replacement single piston metric calipers were standard equipment on 1978-88 GM midsize cars (Cutlass, Grand Prix, Regals, Monte Carlo, etc.). They feature a 2.38" single piston, shielded bottom inlet, and will save 3-1/2 lbs. per side compared to midsize 1969-1977 caliper.

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Wilwood 120-6426 D154 GM Metric Single Piston Floater Caliper 2.38/.81
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1/8" NPT brake line inlet.

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Wilwood Data Sheet

Emergency Brake Calipers
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910-31046 Instructions (PDF)

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Stop guessing which banjo fittings go with which brake lines. With this kit you get two rubber front brake lines, two banjo bolts with seals, and a pair of easy-to-install brake line tabs and clips.

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(Part #83512011874P)
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Wilwood 120-11874-RD D154 Dual Piston Floater Caliper, GM, Red
(Part #83512011874RD)
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Installation Instructions (PDF)

Wilwood 140-12097-P D154 Front Brake Caliper Kit, Polished
(Part #83514012097P)
                        Wilwood's D154 Front Caliper Kit is a direct bolt-on 1 or 2 piston, lightweight, high-strength, extreme duty alternative to the OE cast iron "Metric" calipers that were used on a wide range of factory disc brake equipped mid size GM cars and small trucks beginning in 1978. Use of this caliper can still be found on some GM models as late as the year 2002. Forged billet aluminum bodies, stainless steel pistons, and competition style high-temperature seals put an end to the rust, bore pitting, and seal failures that plague the OE caliper design. D154 calipers provide low-maintenance performance and a huge weight savings with high temperature reliability for the street and track. D154 calipers mount in the stock location over stock rotors; use the original style OE D154 brake pads and an OE M10-1.5 banjo bolt brake line mounting. D154 Calipers can be used with most wheels that clear the OE calipers. The front calipers with 2.50" piston provide 4.90 square inches of piston area per caliper, in order to maintain the original front to rear brake bias and use of the OE master cylinder. The D154 is also available in a two piston version with 1.62 pistons, offering 4.12 square inches of area. Kits contain Wilwood's hardened slide pins and BP-10 high friction pads. Matching rear calipers are also available for custom installations. Custom stainless steel brake lines are also available.

Installation Instructions (PDF)

Wilwood 140-12097-R D154 Front Caliper Kit, 2.50 Piston/1.04 Rotor
(Part #83514012097R)
                        Wilwood's D154 Front Caliper Kit is a direct bolt-on 1 or 2 piston, lightweight, high-strength, extreme duty alternative to the OE cast iron "Metric" calipers that were used on a wide range of factory disc brake equipped mid size GM cars and small trucks beginning in 1978. Use of this caliper can still be found on some GM models as late as the year 2002. Forged billet aluminum bodies, stainless steel pistons, and competition style high-temperature seals put an end to the rust, bore pitting, and seal failures that plague the OE caliper design. D154 calipers provide low-maintenance performance and a huge weight savings with high temperature reliability for the street and track. D154 calipers mount in the stock location over stock rotors; use the original style OE D154 brake pads and an OE M10-1.5 banjo bolt brake line mounting. D154 Calipers can be used with most wheels that clear the OE calipers. The front calipers with 2.50" piston provide 4.90 square inches of piston area per caliper, in order to maintain the original front to rear brake bias and use of the OE master cylinder. The D154 is also available in a two piston version with 1.62 pistons, offering 4.12 square inches of area. Kits contain Wilwood's hardened slide pins and BP-10 high friction pads. Matching rear calipers are also available for custom installations. Custom stainless steel brake lines are also available.

Installation Instructions (PDF)

Wilwood 140-12099-BK D154 Front Brake Caliper Kit, Black Anodized
(Part #83514012099BK)
                        Wilwood's D154 Front Caliper Kit is a direct bolt-on 1 or 2 piston, lightweight, high-strength, extreme duty alternative to the OE cast iron "Metric" calipers that were used on a wide range of factory disc brake equipped mid size GM cars and small trucks beginning in 1978. Use of this caliper can still be found on some GM models as late as the year 2002. Forged billet aluminum bodies, stainless steel pistons, and competition style high-temperature seals put an end to the rust, bore pitting, and seal failures that plague the OE caliper design. D154 calipers provide low-maintenance performance and a huge weight savings with high temperature reliability for the street and track. D154 calipers mount in the stock location over stock rotors; use the original style OE D154 brake pads and an OE M10-1.5 banjo bolt brake line mounting. D154 Calipers can be used with most wheels that clear the OE calipers. The front calipers with 2.50" piston provide 4.90 square inches of piston area per caliper, in order to maintain the original front to rear brake bias and use of the OE master cylinder. The D154 is also available in a two piston version with 1.62 pistons, offering 4.12 square inches of area. Kits contain Wilwood's hardened slide pins and BP-10 high friction pads. Matching rear calipers are also available for custom installations. Custom stainless steel brake lines are also available.

Installation Instructions (PDF)

Wilwood 140-12099-R D154 Front Caliper Kit, 1.62 Piston/1.04 Rotor
(Part #83514012099R)
                        Wilwood's D154 Front Caliper Kit is a direct bolt-on 1 or 2 piston, lightweight, high-strength, extreme duty alternative to the OE cast iron "Metric" calipers that were used on a wide range of factory disc brake equipped mid size GM cars and small trucks beginning in 1978. Use of this caliper can still be found on some GM models as late as the year 2002. Forged billet aluminum bodies, stainless steel pistons, and competition style high-temperature seals put an end to the rust, bore pitting, and seal failures that plague the OE caliper design. D154 calipers provide low-maintenance performance and a huge weight savings with high temperature reliability for the street and track. D154 calipers mount in the stock location over stock rotors; use the original style OE D154 brake pads and an OE M10-1.5 banjo bolt brake line mounting. D154 Calipers can be used with most wheels that clear the OE calipers. The front calipers with 2.50" piston provide 4.90 square inches of piston area per caliper, in order to maintain the original front to rear brake bias and use of the OE master cylinder. The D154 is also available in a two piston version with 1.62 pistons, offering 4.12 square inches of area. Kits contain Wilwood's hardened slide pins and BP-10 high friction pads. Matching rear calipers are also available for custom installations. Custom stainless steel brake lines are also available.

Installation Instructions (PDF)

Wilwood 15Q-6831K D154 PolyMatrix Q Brake Pad Set, GM Metric
(Part #83515Q6831K)
                        
  • Medium friction, smooth engagement, low abrasion on iron rotors
  • Flat torque curve Can be used with aluminum rotors on Sprint Car applications
  • Low wear rate at low to medium Temps
  • High performance ceramic based street formula
  • Lowest dust and noise
  • Compatible with all types of steel or iron rotors
  • Aluminum rotors for racing

Compound Data Sheet (PDF)

Speedway Motors 3-Piece 1979-Up IMCA GM Metric Midsize Spindle
(Part #91034501)
                        Speedway Motors is proud to introduce our exclusive  3-piece 1979-Up GM Metric midsize spindle. Our advanced engineering  techniques allowed for the recreation of an OEM spec spindle in a newly  forged, heat-treated steel design that is both stronger and lighter than  the original. The unique three-piece construction provides for fast,  convenient and affordable replacement of individual components in the  event of a crash. These spindles IMCA approved for  use in competition.

Kit includes spindle, bolt-on steering arm, caliper bracket and necessary hardware. Assembly is required. Choose (L) Left or (R) Right side.

Works great with our 1979-Up GM Metric Front Brake Rotors, bearings, calipers, etc.
  • Forged, heat-treated steel
  • Precision OEM geometry
  • Direct replacement for factory spindle
  • Approved for use in IMCA sanctioned events
  • Three-piece design for quick, easy replacement
  • Replacement parts available separately
Banjo Brake Fitting Kit, 7/16-20 to -3 AN
(Part #6172930)
                        One part number gets you all the parts needed to hook a -3 AN style line to a GM caliper. Each kit includes 2 banjo bolts, 2 banjo fittings, and 5 washers. Each kit services 2 calipers.
                    
Banjo Brake Fitting Kit, 7/16-20 to -4 AN
(Part #6172940)
                        One part number gets you all the parts needed to hook a -4 AN style line to a GM caliper. Each kit includes 2 banjo bolts, 2 banjo fittings, and 5 washers. Each kit services 2 calipers.
                    
Speed Bleeder Bleed Screws, 10mm-1.5
(Part #6173958)
                        

The Speed Bleeder is a direct replacement for the bleeder assembly in your caliper. This makes brake bleeding truly a one-man operation. Simply "crack" the bleeder loose, pump the brakes, then close the bleeder. 

Sold in pairs.

Read more about bleeding brakes in our tech article, How To Bleed Your Brake Lines.