[ROVERNET - UK] P5 braking "pulse"

Richard Sharpe trowzerkoff at hotmail.com
Thu Aug 12 21:22:46 BST 2004

First generation brake servos (as fitted on P4's and early P5's) all tended 
to pulse gently but noticeably when the foot pedal was depressed.  Provided 
the brakes work effectively, there's nothing to be concerned about.  
[Interestingly even the late 1960's BMW 2800 rocket ships had pulsing brake 
servos and - from memory - the handbook informed one that this was perfectly 
normal and should be taken as a sign that the brake system was working as 

On the other hand, if there's a loss of braking effectiveness then some 
detective work's needed.  Putting the car on a rolling road brake tester 
will show how things stand.  A warped front brake disc is a possibility - 
especially if you can feel some reaction at the steering wheel as you brake. 
  You can also clamp flexible brake hoses - especially to the rear brakes - 
and see what happens.

>New question: My brakes "pulse" as though pushing back on the pedal when I
>brake. There is a sort of hardening and loss of effectiveness, then a
>release (pedal gives way a bit, but never fully, as with a failed master),
>if I keep steady pressure on the pedal. No visible fluid leaks. I've 
>the rear cylinders, not the front calipers yet. But I'm wondering if that
>sounds like a familiar servo-related symptom to anyone?
>Thanks in advance for any thoughts.
>on 8/11/04 6:25 PM, Linda & Ben Rodgers at rodgl at pei.sympatico.ca wrote:
> > Hi Peter
> > My P5 Mk3 does that too, I just move the knob alittle
> > clockwise or counter clock and it goes out.
> > regards Ben
> >
> >
> >
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