1975 BMW 2002 Braking Issue

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04-10-18, 14:18
ecooney

1975 BMW 2002 Braking Issue

I thought I'd throw a post up here as I know a few members have owned these in the past (Ahem ANDY).

I'm having an issue troubleshooting a braking problem where the car pulls to the right-hand side under braking.

Originally when the car was purchased there was literally no assisted braking at all and the car pulled to the right.
On investigation I found a vacuum leak going from the inlet manifold to the 2 remote mounted brake servos after the one-way valve.
I sorted this out and hey-presto the servos worked again.

Took it for a spin and it was still pulling to the right only harder now as the servos were obviously adding some much needed braking force.
The next step was to inspect all 4 corners. Everything looked good and all components (whilst they are tired looking) were in good serviceable condition.

Next step today was to bleed the entire system. There was air in the lines which was expected but after a full fluid flush it's still pulling to the right.

I'm trying to figure out if this could be a master cylinder issue or (from what I've read) a pressure differential issue.

I have a Haynes Manual but it doesn't detail the working of the braking system very well.
I'd like to understand how the pressure from the 2 servos is applied. I believe it is equal pressure front and rear (not left and right).

Any assistance would be appreciated.
04-10-18, 15:31
Andy

Can be a bit of a pain to balance this from what I remember, like a Kugelfischer injection system. My thoughts are that it is servo or master cylinder related. The braking system in a RHD is compromised compared to a LHD with over complication of extra pieces and different placement.
05-10-18, 08:50
spike

Check calipers,all round,
05-10-18, 20:17
rebel.ranter

Quote:

Originally Posted by spike

Check calipers,all round,

Do these have disc brakes all round? I would have thought drum brakes on the back at least. Could be a brake shoe adjustment issue or a leaky wheel slave cylinder.
05-10-18, 20:37
ecooney

Quote:

Originally Posted by rebel.ranter

Do these have disc brakes all round? I would have thought drum brakes on the back at least. Could be a brake shoe adjustment issue or a leaky wheel slave cylinder.

It has discs on the front and drums on the rear.

By all inspections so far there are no issues with leaks etc.

It’s in with Perfect Car at the minute and will be getting the once over tomorrow all going well.

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