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Front Brake Piston Diameter?

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Old Jan 2, 2008 | 08:22 PM
  #1  
Neil87Z28's Avatar
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From: Tampa, FL
Car: 1987 IROC Z28
Engine: 427ci
Transmission: TH350
Front Brake Piston Diameter?

Does anyone know the diameter of the brake caliper piston for the stock 10.5" front brakes?

Thanks.

--Neil
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Old Jan 2, 2008 | 10:16 PM
  #2  
ebmiller88's Avatar
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From: Fort Mill, SC, USA
Car: '88 Iroc, '91 RS, and a '70 RS
Engine: 5.7 TPI; 5.0 TBI; ZZ4/T56 on the ag
Transmission: A4, A4, slated to be a T56
Re: Front Brake Piston Diameter?

2.5"

Ed
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Old Jan 2, 2008 | 11:13 PM
  #3  
Neil87Z28's Avatar
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Joined: Nov 2005
Posts: 135
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From: Tampa, FL
Car: 1987 IROC Z28
Engine: 427ci
Transmission: TH350
Re: Front Brake Piston Diameter?

Thanks Ed. Are the C5 calipers 40mm x 2? I'm trying to figure out the hydraulic ratios and how they will change when I swap the brakes for the C5s.
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Old Jan 4, 2008 | 08:39 AM
  #4  
ebmiller88's Avatar
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Joined: Mar 2001
Posts: 6,420
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From: Fort Mill, SC, USA
Car: '88 Iroc, '91 RS, and a '70 RS
Engine: 5.7 TPI; 5.0 TBI; ZZ4/T56 on the ag
Transmission: A4, A4, slated to be a T56
Re: Front Brake Piston Diameter?

Either 40 or 41, they're the same as 1LE piston diameter so if you use a disc/drum master you'd be fine hydraulically.

Ed
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