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Re: 733i brakes (archive)
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Posted by Grant on January 20, 2001 at 22:27:56:

In Reply to: 733i brakes posted by George Semar II on January 20, 2001 at 19:49:37:


OK guys, what is going on with my '81 733i automatic's brakes? When I press the brake pedal slowly (like in a parking lot looking for a space) it will go to the floor then stop the car. Very little or no resistance at all untill it his bottom. It doesn't "pump up" if I pump it slowly, it just goes down to the floor with each slow pump.
If at any time I press the pedal quickly (quick stop or panic stop) it stays firm and high stopping the car as well as it should. The accumulator and brake pads( all caliper pistons move smoothly) have been replaced but no change in pedal action. What to check next?

I agree with Ben. Check the master cylinder first. Place your hand under the master cylinder. Is there any brake fluid there? Can you see any leakage. Remove cover above brake pedal. Look at where brake pedal rod goes though firewall to master cylinder. Can you see any fluid there. What you might be experiencing is the piston seals are leaking when you depress the piston in the master cylinder. This leak will only get worse.


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