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1978-Up GM Metric Brake Calipers, IMCA Approved

Specs
Material Type:
Steel
Sold in Quantity:
Each
Finish:
Natural
Color:
Gray
Caliper Pistons:
Single
MFG. Part #:
-
Centerline of Holes:
5.50
Piston Diameter:
2.38
1978-Up GM Metric Brake Calipers, IMCA Approved
1978-Up GM Metric Brake Calipers, IMCA Approved
1978-Up GM Metric Brake Calipers, IMCA Approved
1978-Up GM Metric Brake Calipers, IMCA Approved
VIDEO
1978-Up GM Metric Brake Calipers, IMCA Approved

Click image to enlarge

Details

Reviews (11)

Q & A (15)

What's in the Box

Info

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 4.3 out of 5 by 11 reviewers.
RATING BREAKDOWN
11 reviews
5 Stars
6
4 Stars
3
3 Stars
1
2 Stars
1
1 Star
0
RECOMMEND THIS PRODUCT:

Wildbilrussell
Verified Purchaser
Gadsden AL

Just what I needed

August 25, 2016
No complaints. Would use again if I build another project car.
Yes, I recommend this product.
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Kierstead Racing
Verified Purchaser
St. cloud, Minnesota

Exactly what i was looking for.

May 03, 2016
Very responsive, and light weight
Pros:
  • Imca Legal
  • Light Weight
Yes, I recommend this product.
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topolino gasser
Verified Purchaser
lancaster pa

bought as a replacement part

April 25, 2016
Bought the dics brake kit and after a few years, had a leak in the left front. This caliper fixed it
Yes, I recommend this product.
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Willys
Verified Purchaser
Quebec Canada

great quality product,

November 17, 2015
great quality parts that fit well and function perfect.
Yes, I recommend this product.
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T&L
Verified Purchaser
St. Paul, MN

I have bought this product many times with great results.

November 16, 2015
It has the speedway logo, is an exact replacement. Works great.
Yes, I recommend this product.
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Eastern Hot Rodder magazine
Verified Purchaser
Verified Reviewer
Murphy, NC

Like the light weight

October 14, 2015
I like that these saved 7 lbs off the front when compared to the 73-77 calipers. They came in my straight axle kit and fit well with plenty of Clearence on my ET ten spokes. Remember they use a 7/16-20 fitting and not the metric banjo fitting. Speedway's kit seems to be getting better.
Pros:
  • Save 7lbs Off The Front
Yes, I recommend this product.
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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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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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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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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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Page 1 of 2

Product Q&A

15 questions : 15 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.
1 answers

Will these calipers work with the .810 rotors that come in the winters grand national rearend #802-95345

racer#39
Winston, OR
August 04, 2015

Will these calipers work with the .810 rotors that come in the winters grand national rearend #802-95345

Answers

August 04, 2015
Eric
Expert
These calipers are intended for 1" thick rotors but they will work with .810" thick brake rotors. We do recommend using brake pad spacers 91041908 to compensate for the difference in the rotor thickness.
Page 1 of 2

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