<VV> 4-Piston Calipers - Non-Corvair

[JVHRoberts at aol.com]

Well, early GM 4 pot calipers had their problems. But pad changes are STILL  
easier witht those than single piston units. 
 
In a message dated 6/30/2006 2:39:13 PM Eastern Standard Time,  
hyarnell1 at earthlink.net writes:

I  remember the four piston calipers from the 60s-70s, and what a pain in the 
 
ass they were. You had 4 times the chance of siezing a piston or  leakage.
As for replacing pads, the newer GM's have only one bolt to undo  on the 
caliper, and the caliper pivots on the second. Slip out the old  pads, 
depress the piston, install new pads, and you're done.

Harry  Yarnell
Perryman Garage and Orphanage
hyarnell1 at earthlink.net
-----  Original Message ----- 
From: <JVHRoberts at aol.com>
To:  <TheFreshPrinceofCorvair at comcast.net>;  <virtualvairs at corvair.org>
Sent: Friday, June 30, 2006 11:30  AM
Subject: Re: <VV> 4-Piston Calipers -  Non-Corvair


>
> For racing, lots.
> A 4 piston  caliper is fixed, no sliding mounts. This makes sure everything
> stays  square and doesn't move in unexpected ways.
> The body of a 4 piston  caliper is FAR more rigid than the 'C' clamp of a
> single piston  caliper, giving a FAR more firm pedal, and allowing the use 
> of  a
> smaller bore M/C for better mechanical advantage.
> And pad  changes are a total breeze compared to most single piston 
>  calipers.
> Pull a pair of pins, leaving the caliper in place, pry the  pistons back, 
> slip
> in  the new pads, stick the pins back  in. On my 300ZXTT, a pad change 
> takes 5
> minutes per wheel,  including jacking the car up and taking the wheel off!
> Downside? They  cost more. That's about it.
>
> John