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Wilwood 120-9333 GM Iron Metric Caliper, 2 Inch Piston

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Specs
Centerline of Holes:
5.46
Material Type:
Steel
Overall Length:
6.62
Color:
Gray
Sold in Quantity:
Each
Finish:
Natural
Inlet fitting:
10mm-1.5
Rotor Diameter:
11.75
Piston Diameter:
2.00
Caliper Pistons:
Single
MFG. Part #:
120-9333
Rotor Thickness:
1.00
Garage Sale:
No
Wilwood 120-9333 GM Iron Metric Caliper, 2 Inch PistonWilwood 120-9333 GM Iron Metric Caliper, 2 Inch Piston
Wilwood 120-9333 GM Iron Metric Caliper, 2 Inch Piston

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Wilwood 120-9333 GM Iron Metric Caliper, 2 Inch Piston

Details

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Q & A

What's in the Box

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. 

To address these needs, Wilwood has tooled up two separate castings that are fitted with either 2.75" or 2" stainless steel pistons and high temperature bore seals. Each casting is designed specific for its intended bore size. The calipers are strong and precise, without unnecessary added weight from oversized castings. The stainless steel pistons resist corrosion while helping to slow the heat transfer from the pads. The high temperature seals provide long service life when used in hard braking applications and maintain their resilience to provide positive piston retraction on release. In addition to the optional piston sizes, two models are available with slide pin vibration dampers installed to help reduce rattle and other noise. 

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. 

Item Details

Fits LH and RH

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1978-Up GM Metric Brake Calipers, IMCA Approved
                        

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.

AFCO 7241-9005 Undersized 2-1/4 Inch GM Metric Caliper, RH Side
                        

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

  • Undersized: 6.620 lbs.
  • 10mm - 1.5 inlet

Undersized Metric Calipers:

Can be used on the right front of open wheel modifieds and street stocks on dirt surfaces to reduce right front braking bias to aid in corner entry. Can be used on the rear of open wheel modifieds and street stocks racing on pavement to reduce rear brake bias.

 

Wilwood 120-8924 GM Iron Metric Caliper, 2-3/4 Inch Piston
                        

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. 

To address these needs, Wilwood has tooled up two separate castings that are fitted with either 2.75" or 2" stainless steel pistons and high temperature bore seals. Each casting is designed specific for its intended bore size. The calipers are strong and precise, without unnecessary added weight from oversized castings. The stainless steel pistons resist corrosion while helping to slow the heat transfer from the pads. The high temperature seals provide long service life when used in hard braking applications and maintain their resilience to provide positive piston retraction on release. In addition to the optional piston sizes, two models are available with slide pin vibration dampers installed to help reduce rattle and other noise. 

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. 

Big Bore GM Metric 1978-88 Brake Caliper
                        

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
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  • Extra ribs have been added internally while unnecessary weight was removed
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  • Each caliper includes:
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    • clips
    • slide pins
    • banjo bolt
    • washers
    • bleeder screw
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These aluminum metric calipers are track tested and proven to have less flex, better pedal feel, less brake fade, and less pad taper than the competition. They are 15 lbs. lighter than stock and USMTS/UMP approved.  These calipers from AFCO come standard with bleeder.

To install Speed Bleeders will require the same combo as Wilwood calipers use: 8352200063 (or 8352200627 set of four) and Bleeders 6173954.

  • 15 lbs. lighter than stock (per car)
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  • 2" piston
  • Comes standard with bleeder
  • Quality control checked and pressure tested
  • 1/8" NPT inlet and 1/8" NPT Bleeder port
  • Fits left or right side of chassis
  • 5-1/2" mount spacing
DOT Braided Stainless Brake Hoses, 1978-88 GM, 10mm-1.5
                        

DOT approved brake line kits include two stainless steel -3 AN brake lines with the banjo fitting installed, banjo bolts and washers, 3/8"-24 IFF frame adapter fittings and frame tabs with clips. Includes -3 AN fittings and adapters to connect them to 3/16" brake line using a 3/8"-24 IFM flare nut.

  • Stainless steel braid over Teflon® hose
  • Reduces volumetric expansion of brake lines
  • Reduces brake fade
  • Less susceptible to debris than rubber line
Rubber Front Brake Lines & Fitting Kit, 10mm-1.5
                        

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
  • 3/8"-24 IFF and 10mm-1.5
  • For 1978-1988 GM Calipers

Lines are 15" in length. Features 3/8"-24 IFF at the chassis fitting to accept 3/16" brake line.

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