Re: '86 5ktq brakes

[Igor Kessel <e6941tb@ix.netcom.com>]

mjs wrote:

> my 86 5ktq's brake system is acting up.  first of all, it FAILS the bomb
> test but i'm trying to determine if anything else is bad.  when the car
> is cool, the brake system works fine except for the fact that the power
> assist dwindles after turning the car off.  when the car gets hot,
> typically after baking in the sun all day, the amount of brake pedal play
> seems to increase before any braking action commences.  after moving
> through this "dead zone" the brakes work, except that the rear brakes
> begin to drag.  the more time that goes by, the more the rear brakes seem
> to drag (with no input from the driver).
> 
> i've run the system with the ABS on and off and have had similar results.
> i know that i need the pressure accumulator, but could anything else be
> bad, too?

Yes. You've also gotten a sticky brake MC. BTDT this past December. It was exactly 
the same symptom: I would drive the car for a while, then after several brake 
applications the fluid becomes warm, the piston in MC expands and jams in the bore 
leaving the RR brake circuit under unrelieved pressure (that's why you have the RR 
brake drag and lots of free pedal travel).
The MC is not rebuildable. Replace it.

-- 
Igor Kessel
'89 200TQ - 18psi (TAP)
'97 A4TQ - on the boat
Philadelphia, PA
USA