Re: 505 sedan rear brakedrag

Gordon Brown (102661.3306@compuserve.com)
Sun, 29 Nov 1998 23:52:24 -0500

Thad,
I had the same problem with my '84 505, and although at first it
seemed to be related to a seized handbrake cable, I still had problems
after replacing both cables. In fact, after using the hand brake, one brake
would drag and I would have to reach under the back of the car and manually
release the caliper lever.
The calipers are quite complex units, with an internal spring
(inside the piston) and an external spring. Pulling on the handbrake pulls
the piston lever which expands the caliper piston, squeezing the pads
against the rotor. When you release the handbrake, the spring tension in
the piston serves to pull the lever back. The exterior spring is an
auxiluary.
The component common to the hydraulic footbrake and the mechanical
handbrake is the piston. With the handbrake set, the foot brake is much
harder because there is very little travel left in the rear caliper
pistons; you're activating the front brakes only.
In my case, the problem was a defective piston-lever assembly. The
car had over 300k km and the calipers, although reconditioned several
times, were original. Replacing them finally solved the problem.
Since you replaced your calipers relatively recently, the first
place to look is a sticking brake cable, but also check for excessive pad
wear. If these are OK, check for correct movement of caliper lever to see
if it sticks. (Compare lever travel on both sides) NOTE: Dismantling and
rebuilding calipers without technical information can ruin them; you need
to rotate the piston 20 degrees before attempting to remove it!!!
Hope this helps.

Gordon Brown

<The brakes won't let go immediately upon release of the hand brake lever!
I have to drive up to 1 mile and/or pump the hand lever to get the rear
brakes to finally release.
The pads and callipers were replaced @ 12,000 miles ago.
Put the car is on the lift and my technician noticed that foot
braking also has drag, but not as much as with the hand lever.
Since the hand lever is mechanical, and foot brake is hydrolic, what
component is common to both mechanisms so as to cause this drag?
OR
do I have two seperate problems with similar symptoms.

All help, advice, and anecdotes appeciated.

Thad Dabrowski

>The brakes won't let go immediately upon release of the hand brake lever!
I have to drive up to 1 mile and/or pump the hand lever to get the rear
brakes to finally release.
The pads and callipers were replaced @ 12,000 miles ago.
Put the car is on the lift and my technician noticed that foot
braking also has drag, but not as much as with the hand lever.
Since the hand lever is mechanical, and foot brake is hydrolic, what
component is common to both mechanisms so as to cause this drag?
OR
do I have two seperate problems with similar symptoms.

All help, advice, and anecdotes appeciated.

Thad Dabrowski<

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