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 FAQ: Brake Rotors and Pads

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deekster_caddy
Master



Name : Derek
Age : 52
Location : Reading, MA
Joined : 2007-01-31
Post Count : 7717
Merit : 109

FAQ: Brake Rotors and Pads - Page 22 Empty
PostSubject: Re: FAQ: Brake Rotors and Pads   FAQ: Brake Rotors and Pads - Page 22 EmptyMon Mar 02, 2015 4:57 pm

Our pistons do NOT rotate as they extend. That tab is there to prevent the piston from rotating. The e-brake uses a mechanical screw, which is why you have to 'wind' them back in when you replace the pad. The grooves in the piston need to be lined up to go around that tab when you put it back together.
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Mr.Riviera
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Mr.Riviera


Name : Matthew
Age : 38
Location : Florida
Joined : 2007-01-17
Post Count : 4394
Merit : 101

FAQ: Brake Rotors and Pads - Page 22 Empty
PostSubject: Re: FAQ: Brake Rotors and Pads   FAQ: Brake Rotors and Pads - Page 22 EmptyWed Mar 04, 2015 12:45 pm

deekster_caddy wrote:
Our pistons do NOT rotate as they extend. That tab is there to prevent the piston from rotating. The e-brake uses a mechanical screw, which is why you have to 'wind' them back in when you replace the pad. The grooves in the piston need to be lined up to go around that tab when you put it back together.

Good to know. So do all rear pads for our cars have this tab?
And if i hit the E brake it will cause the piston to rotate out, but not during normal operation?

Matthew

_________________
1996 with 254k miles, L32 4" FWI -> ported N* -> Ported Gen V w/3.0" Pulley, Stage 3 Phenolic I/C, ZZP FMHE, 1.84 RR, Headers and 3" pipe to mufflers, F-body brakes, and lowered on Eibachs. -RIP
AMG C400 White on black. Stage 2 w/E30 - 11.9@117 -daily
FAQ: Brake Rotors and Pads - Page 22 Dsc_0110
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deekster_caddy
Master



Name : Derek
Age : 52
Location : Reading, MA
Joined : 2007-01-31
Post Count : 7717
Merit : 109

FAQ: Brake Rotors and Pads - Page 22 Empty
PostSubject: Re: FAQ: Brake Rotors and Pads   FAQ: Brake Rotors and Pads - Page 22 EmptyMon Mar 09, 2015 1:29 pm

The piston never rotates during normal use, e-brake or not. The tab/slot keeps it from rotating. The e-brake turns a screw on the inside which forces the piston out. That's also the 'adjustment' and the screw prevents the piston from retracting too far back. So when you go to replace pads, you need to screw the piston back in - that's the only time the piston ever turns.

Every rear-disc GM I've seen since the mid-90's have been the identical way. My '94 Regal was like this. The rear-disc conversion kit I had for my '86 Suburban used this too, but the calipers were from a '78 Eldorado.... I never needed to replace the pads but based on the e-brake setup I think it was the same design. With the exception that the '78 Eldo calipers leaked brake fluid...
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FAQ: Brake Rotors and Pads - Page 22 Empty
PostSubject: Re: FAQ: Brake Rotors and Pads   FAQ: Brake Rotors and Pads - Page 22 Empty

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FAQ: Brake Rotors and Pads
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