A Cars forum. AutoBanter

If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below.

Go Back   Home » AutoBanter forum » Auto makers » BMW
Site Map Home Register Authors List Search Today's Posts Mark Forums Read Web Partners

1987 BMW 325E Brake Pressure Build Up



 
 
Thread Tools Display Modes
  #11  
Old May 25th 07, 11:41 PM posted to alt.autos.bmw
Psycho
external usenet poster
 
Posts: 121
Default 1987 BMW 325E Brake Pressure Build Up

This is commonly caused by a hose that is broken internally. The fluid
is allowed past but the "break" in the hose acts like a check valve
and doesn't allow the fluid to return and the caliper piston to
retract. This is not the case here as it would happen the first time
you applied the brakes. I also believe it is caused by a blockage in
the system. I've never seen a vacuum assist do this but I can't give a
definitive no on it either... As stated before, disconnect (and
plug/cap the vacuum line to the brake assist unit and see if the
problem goes away. Please let us know what fixes the problem.

On Fri, 25 May 2007 16:00:36 +0100, "Dave Plowman (News)"
> wrote:

>In article >,
> admin > wrote:
>> > Pretty strange behavior allright. I see that the Bentley manual does
>> > list this condition under trouble shooting and suggests that it may
>> > be caused by the master cylinder although I don't personally
>> > understand how that would happen.

>
>> The master cylinder has a relief port in it - that relieves brake
>> pressure when you let up on the brake pedal. It basically opens the
>> brake circuit(s) to the reservoir. This same port is also how the system
>> is kept full as pads wear and the caliper pistons move out.

>
>> If this port is plugged up, or the pedal isn't returning fully to the
>> top position, it will cause the symptoms described.

>
>I'm not convinced this could cause the brakes to lock on, though. Drag
>slightly, yes. I'd be looking at a power assistance fault.

Ads
  #12  
Old May 26th 07, 12:21 AM posted to alt.autos.bmw
[email protected]
external usenet poster
 
Posts: 3
Default 1987 BMW 325E Brake Pressure Build Up

On May 24, 10:49 am, wrote:
> I am experiencing a problem where the brakes lockupafter about four
> to five miles of travel. I was told that the problem could be
> resolved by replacing the master cylinder. I did, but the problem
> continues. The only way to get going, is to release thepressurevia
> the bleeding valves. This works sometimes for an eighth of a mile or
> sometimesupto ten miles. I removed all the relays from the ABS unit
> with no luck.
>
> Is there someone who has experience this problem? How was it resolved?


5/25/2007 - Thanks for the many responses. I will try the suggestions
on Monday (Momorial Day)

To clarify - The symtom is like it has the hand brake connected to all
four wheels, and is applied to the maximum. All four wheels get very
hot if I try to push ahead before a complete stop. Whenever it is
totally locked, and I try to move, it just burns the clutch and the
car just squats.

I will post the results of the suggestions I have already received.

  #13  
Old May 26th 07, 02:31 AM posted to alt.autos.bmw
Dan Buchan
external usenet poster
 
Posts: 58
Default 1987 BMW 325E Brake Pressure Build Up

Jeff Strickland wrote:
> > wrote in message
>> Brake vacuum servo is leaking................

> Please, tell us more. I've never heard of this, and I'm not sure what
> part(s) you are talking about, and how they play with the rest of the
> system.


It sounds plausible. Pressing the brake pedal opens a valve to let
engine vacuum pull the brakes on harder, so a leak there could cause
such a problem.

That said, all cases of brakes locking on that I've seen have been
caused by a stiff linkage on cars that have the controls on the opposite
side to the master cylinder (ie RHD in a car originally designed for
LHD). But in that case the pedal would stay down.
  #14  
Old June 28th 07, 03:14 AM posted to alt.autos.bmw
[email protected]
external usenet poster
 
Posts: 3
Default 1987 BMW 325E Brake Pressure Build Up

On May 25, 7:21 pm, wrote:
> On May 24, 10:49 am, wrote:
>
> > I am experiencing a problem where the brakes lockupafter about four
> > to five miles of travel. I was told that the problem could be
> > resolved by replacing the master cylinder. I did, but the problem
> > continues. The only way to get going, is to release thepressurevia
> > the bleeding valves. This works sometimes for an eighth of a mile or
> > sometimesupto ten miles. I removed all the relays from the ABS unit
> > with no luck.

>
> > Is there someone who has experience this problem? How was it resolved?

>
> 5/25/2007 - Thanks for the many responses. I will try the suggestions
> on Monday (Momorial Day)
>
> To clarify - The symtom is like it has the handbrakeconnected to all
> four wheels, and is applied to the maximum. All four wheels get very
> hot if I try to push ahead before a complete stop. Whenever it is
> totally locked, and I try to move, it just burns the clutch and the
> car just squats.
>
> I will post the results of the suggestions I have already received.


06/27/2007 - As I promised, even though it's been so long, I did
change the vacuum booster and that did fix my problem... Thank you
all.

  #15  
Old June 28th 07, 04:31 PM posted to alt.autos.bmw
[email protected]
external usenet poster
 
Posts: 350
Default 1987 BMW 325E Brake Pressure Build Up

On Wed, 27 Jun 2007 19:14:01 -0700, wrote:

>On May 25, 7:21 pm, wrote:
>> On May 24, 10:49 am, wrote:
>>
>> > I am experiencing a problem where the brakes lockupafter about four
>> > to five miles of travel. I was told that the problem could be
>> > resolved by replacing the master cylinder. I did, but the problem
>> > continues. The only way to get going, is to release thepressurevia
>> > the bleeding valves. This works sometimes for an eighth of a mile or
>> > sometimesupto ten miles. I removed all the relays from the ABS unit
>> > with no luck.

>>
>> > Is there someone who has experience this problem? How was it resolved?

>>
>> 5/25/2007 - Thanks for the many responses. I will try the suggestions
>> on Monday (Momorial Day)
>>
>> To clarify - The symtom is like it has the handbrakeconnected to all
>> four wheels, and is applied to the maximum. All four wheels get very
>> hot if I try to push ahead before a complete stop. Whenever it is
>> totally locked, and I try to move, it just burns the clutch and the
>> car just squats.
>>
>> I will post the results of the suggestions I have already received.

>
>06/27/2007 - As I promised, even though it's been so long, I did
>change the vacuum booster and that did fix my problem... Thank you
>all.


Well there you are. Glad to be of assistance and I believe that the Brake
Booster was a suggestion of mine following several similar instances of this
problem in the past.
 




Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
1987 325e driveshaft robbity BMW 10 April 10th 07 04:56 PM
Change Air Filter on 1987 325e F.T.S. BMW 1 March 19th 07 08:00 PM
1987 325e Heat not working [email protected] BMW 2 November 29th 06 08:19 PM
My 1987 325e E30 will only start when it wants to... Please help... Chutluck BMW 5 February 3rd 05 02:19 AM
1987 325E Gas tank M Hayes529 BMW 1 September 28th 04 09:40 AM


All times are GMT +1. The time now is 10:04 PM.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright ©2004-2024 AutoBanter.
The comments are property of their posters.