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America's Oldest Speed Shop ® 800.979.0122 Lincoln, NE
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800.979.0122

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Big Bore GM Metric 1978-88 Brake Caliper

SAME DAY SHIPPING! Order within the next 33 minutes and receive same day shipping

Specs
Material Type:
Steel
Sold in Quantity:
Each
Finish:
Natural
Caliper Pistons:
Single
MFG. Part #:
910-31040
Garage Sale:
No
Centerline of Holes:
5.50
Piston Diameter:
2.75
Rotor Thickness:
1.00
Big Bore GM Metric 1978-88 Brake Caliper
Big Bore GM Metric 1978-88 Brake Caliper
Big Bore GM Metric 1978-88 Brake Caliper

Click image to enlarge

Details

Reviews

Q & A

What's in the Box

If you are using 1978-88 GM Metric style brake calipers your choices of piston sizes are pretty much limited to 2-1/2". This isn't bad unless you want to 'tune' your braking by using different size calipers front to rear. By using a larger 2-3/4" piston you will increase the braking force at a wheel over a wheel using a smaller piston.

Bleeder and inlet are both 10mm-1.5 inlet allowing the caliper to be used on either side. Plus, these calipers have been ground smooth to make them easier to paint.

Includes pads and hardware. Sold as EACH.

  • 20% increase in stopping power over stock calipers
  • Can used on the left and right sides
  • Extra ribs have been added internally while unnecessary weight was removed
  • Lighter, stronger, has more stopping power than OEM calipers
  • Each caliper includes:
    • brake pads
    • clips
    • slide pins
    • banjo bolt
    • washers
    • bleeder screw

Notes

  1. Can be configured to be used as left or right.
  2. Has a 2.75 inch bore.
  3. Uses the popular “154” (Chevrolet 78-88 mid size, 83-02 S10) brake pad.
  4. A direct replacement for the “4125/26” (Chevrolet 1978-88 mid size, 1983-02 S10) calipers.
  5. The slide bolt center to center spacing is 5.5"

Customer Reviews

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

Ford Guy
Verified Purchaser
San Diego, CA

Big Bore Caliper a pleasant surprise.

September 07, 2011
Perfect upgrade for my disc brake project, quality is there, paintable after etching the zinc plating...
Pros:
  • Decreased Stopping Distance
  • Easy To Install
  • Zinc plated etch n paint
  • Outperforms stock
Yes, I recommend this product.
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Ford Guy
Verified Purchaser
San Diego, CA

Big Bore Caliper a pleasant surprise.

September 07, 2011
Perfect upgrade for my disc brake project, quality is there, paintable after etching the zinc plating...
Pros:
  • Decreased Stopping Distance
  • Zinc plated etch n paint
  • Easy To Install
  • Outperforms stock
Yes, I recommend this product.
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Was this review helpful? 0 0

fab man
Verified Purchaser
Cosby MO

almost perfect brake bias after adding

October 29, 2010
used for autocross s10 chassis i really like the coating for corrosion
Yes, I recommend this product.
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dirth20
manassas va

GM big bore caliper

April 30, 2010
I'm building a 63 nova II, speedway always has the right parts..Thanks
Pros:
  • Right price
Yes, I recommend this product.
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Page 1 of 1

Product Q&A

9 questions : 9 answers

1 answers

Will these calipers work with your 11.75" X .810" rotors? What brackets can be used with this caliper?

jdtrato
Millington, MI 48746, USA
October 09, 2013

Will these calipers work with your 11.75" X .810" rotors? What brackets can be used with this caliper?

Answers

October 09, 2013
Jason
Yes, the big bore GM metric caliper will work with .810" rotors and up to 12" in diameter
1 answers

Are these "low drag" calipers? Are these considered "low drag" calipers as used on GM products from the 80's-on and requires a stepped master cylinder to function properly?

BootleggerMatt
February 25, 2013

Are these "low drag" calipers? Are these considered "low drag" calipers as used on GM products from the 80's-on and requires a stepped master cylinder to function properly?

Answers

February 25, 2013
Jason
This is a standard caliper, not low drag. These GM metric calipers come with pads and hardware from the manufacturer.
1 answers

are these calipers for GM 10.5" rotors or GM 11.75" rotors

jeffw
January 05, 2013

are these calipers for GM 10.5" rotors or GM 11.75" rotors

Answers

January 07, 2013
Jason
These calipers are mid size GM calipers used on many different rotor diameters thru Speedway and other suppliers. The brackets that retain the calipers need to match the rotor diameter requirements. This can be used with 9.25" to 11.75" rotors
1 answers

Will these brake pads work with a drilled and slotted rotor?

Huntsville, AL
December 07, 2011

Will these brake pads work with a drilled and slotted rotor?

Answers

December 08, 2011
Zach
Speedway part number 91031010. These come with a standard brake pad, intended for use on stock type rotors. You can use these on a drilled and slotted rotor, but you may get dust build up and or squeaking after some time. I would recommend using whatever the manufacturer of the rotors suggests, which is usually a high performance ceramic type pad.
1 answers

are the pistons new

October 20, 2011

are the pistons new

Answers

October 21, 2011
Jason
This is a 100% new caliper
1 answers

What kinda of break pads are included?

Todd
Monroe, GA
July 17, 2011

What kinda of break pads are included?

Answers

July 19, 2011
Zach
These brake calipers (part number 91031040) use the 154 Chevrolet 78-88 mid size, and 83-02 S10 brake pads.
1 answers

Is there a rebuid kit for these available ?

June 06, 2011

Is there a rebuid kit for these available ?

Answers

June 06, 2011
Jason
Sorry, we do not offer a rebuild kit at this time
1 answers

What thickness rotor does this fit ?

April 23, 2011

What thickness rotor does this fit ?

Answers

April 27, 2011
John
You inquired about our big bore caliper under part number 91031040 and this caliper is designed to work with the standard 1.00 to 1.10 thick rotor. To use on a thinner rotor may require the use of a pad spacer to achieve desired braking. We also offer a Wilwood caliper with 2.75 bore, a standard GM Metric caliper with same bore, and a light weight metric caliper with same bore if so desired.
1 answers

Will this caliper replace #910-31045 caliper for mid-size GM cars? Is overall size larger since I have 14" front wheels with 11" rotors?

Belton, TX
February 21, 2011

Will this caliper replace #910-31045 caliper for mid-size GM cars? Is overall size larger since I have 14" front wheels with 11" rotors?

Answers

February 25, 2011
Waymon
Yes this is a direct replacement for item # 90131045. The bleeder and inlet are both 10mm-1.5 not 7/16"-20, allowing the caliper to be used on either side.
Page 1 of 1

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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. 

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

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

Metric caliper is 1978 and newer style.

Wilwood Data Sheet

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AFCO 7241-9001 Oversized 2-3/4 Inch GM Metric Caliper, Right Hand Side
(Part #10672419001)
                        

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  • Oversize: 6.4 lbs.
  • 10mm - 1.5 inlet

Oversized Metric Calipers:

Can be used in the rear of open wheel modifieds and street stocks racing on dirt surfaces to increase rear brake bias. Can be used on the front of open wheel modifieds and street stocks racing on pavement surfaces.

AFCO 7241-9002 Oversized 2-3/4 Inch GM Metric Caliper, Left Hand Side
(Part #10672419002)
                        

These are based on the popular GM Metric calipers with 5-1/2" mounting centers.

  • Oversize: 6.4 lbs.
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Can be used in the rear of open wheel modifieds and street stocks racing on dirt surfaces to increase rear brake bias. Can be used on the front of open wheel modifieds and street stocks racing on pavement surfaces.

 

Wilwood 120-8924 D154 GM Metric Iron Single Piston Floater Caliper
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These all new cast, not rebuilt iron calipers are bolt-on replacements for 1978 and later GM Metric calipers widely used in "spec" racing categories and low cost disc brake conversions. Not IMCA pproved.

Wilwood iron GM Metric calipers combine new part quality with modern machining precision. There are two piston size options to assist builders with properly building static bias into a car. Previously, builders using the metric calipers generally had to mount the same size calipers on all four wheels. This drastically limited the tuning options and often created front to rear bias ratios that were not conducive to good handling and stability under hard braking. Some builders, and other brake suppliers, chose to offer re-machined OE calipers to provide a bias tuning option. Unfortunately re-machining a used casting that was never designed for the larger bore size, can create real compromises in strength, reliability and performance. 

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These calipers are the same physical size and mounting as the GM metric style of calipers. Instead of the stock 2-1/2" piston they have either 2" or 2.75" bores. This allows you to change your brake bias on a dirt car by running bigger pistons on the back and small piston on the right front. The bleeder and inlet are both 10mm-1.5 which allows you to run these calipers on either side. 

All Wilwood GM Metric calipers use the standard D154 type brake pads. 

Note: Slide bolts and slide bolt o-rings are NOT included with this caliper!

Item Details

Fits LH and RH
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  • Reduces brake fade
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1978-Up GM with 10mm-1.5 caliper threads
Rubber Front Brake Lines & Fitting Kit, 10mm-1.5
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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.

  • 15" length including fittings
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