brake problem with '77 450 sel - Mercedes-Benz Forum

 
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post #1 of 3 (permalink) Old 08-07-2008, 11:07 AM Thread Starter
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brake problem with '77 450 sel

Hey I am new to this site and to Mercedes. I recently bought a 1977 450 SEL. I have a problem with the brakes. As I drive the car the brakes build up pressure on the front brakes until it reaches the point of locking the front brakes. After that if I let it sit for a while the brakes release but then the brake peddle goes nearly to the floor and I have very little brake left. After the car is shut off for a while the problem corrects itself but then when I drive it again the whole process repeats. Has anyone else had this problem or can you tell me what is the cause. Thanks.
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post #2 of 3 (permalink) Old 08-07-2008, 06:28 PM
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What do you mean when you say "it reaches the point of locking the front brakes"?
If you mean that the pedal gets hard with no braking effect then you should check for vacuum leaks leading to the brake booster as well as all inlets on the intake manifold. Also the booster diaphram may be leaking.
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post #3 of 3 (permalink) Old 08-08-2008, 06:59 AM Thread Starter
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Thanks for the info!
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