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Need a front right 928GT caliper

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Old 06-15-2010, 06:42 PM
  #16  
jon928se
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From memory
Piston dia increased in '87
Seal design changed in '90 - same dia pistons but different design piston for the new seal.
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Old 06-15-2010, 09:23 PM
  #17  
Landseer
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Originally Posted by Andrew Olson
DOn't know what you mean. There are 2 bleeder screws on the S4 calipers (front and rear).

Andrew, I remembered reading the passage below and thought it applied to the fronts. Didn't remember the details and posted the question.

Found the reference (86 service tech bulletins). Turns out to only apply to the rears. The OP was interested in front.
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Old 06-15-2010, 09:44 PM
  #18  
blown 87
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Originally Posted by Andrew Olson
Nope. GTS's have different sizes, but S4 and GT's had same piston sizes.
S4's had at least three different piston sizes that I know of.
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Old 06-15-2010, 11:31 PM
  #19  
Richard S
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Here's what I have...one front passenger side caliper, never mounted. Raised lettering. $200+shipping. PM me if interested.







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Old 06-15-2010, 11:53 PM
  #20  
AO
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Originally Posted by blown 87
S4's had at least three different piston sizes that I know of.
According to the Tech Spec books, the piston sizes did not change from 87 through 91. Interestingly, the GTS calipers, although a different size, used the same piston sizes too.

1987 Tech Spec Book:


From the 1990-1995 Tech Spec book (for '90/'91):


Same book, but for GTS calipers:
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