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  #1  
Old June 27th, 2016, 07:46 PM
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Chris
1985 110 200 Tdi
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Brake Fade

My brake pedal will go to the floor and I will lose stopping power if I keep the pedal depressed. It will stop if I do short bursts by feels like the system is losing pressure. Is there a way to diagnose the booster?
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  #2  
Old June 27th, 2016, 07:54 PM
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Mike Ferguson
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If the booster fails, the pedal effort will go up dramatically, but the pedal should not go to the floor. My guess is the master or slave cylinder or low fluid. Is it leaking fluid anywhere (under the hood or from the bell housing)?
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Old June 27th, 2016, 08:20 PM
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David
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Have you bled the brakes lately?
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  #4  
Old June 27th, 2016, 08:27 PM
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Stephan Laputka
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The simple things to check..

1. Check each caliper to see if its wet around the bleed nipple. You can do this without taking any wheels off. Maybe you're lucky and you just a bleed valve loosen up on you.

2. Follow the brake lines out of the caliper to where they become metal and check if any of the joints are wet. If you have SS lines than inspect the entire line for wear. If you have rubber lines, check to see nothing rubbed a hole in the line.

3. If everything is dry around the wheels, crawl undernearth and look above the rear differential at where the lines go forward. Check for spots of extreme rust that could have caused a pinhole leak. Lastly check the lines as they route through the engine bay

4. If everything is dry, replace the master cylinder. It's not the booster.

5. Oh, and if you are extremely extremely bad at general maintenance and let your pads get to the point where you're wearing down the backing plate, it's possible the piston on a caliper is so far pushed out that you over extended the seal. So if you have some pads that are absolutely down to nothing, than I would suspect that caliper.
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Old June 27th, 2016, 09:13 PM
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Jimmy
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You have a leak, not a booster failure. The master cylinder can leak into the booster which won't leave any leaks on the ground.
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  #6  
Old June 27th, 2016, 09:32 PM
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Brian
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Quote:
Originally Posted by Jymmiejamz View Post
You have a leak, not a booster failure. The master cylinder can leak into the booster which won't leave any leaks on the ground.
x2 - I had the same symptoms op described - it was the master cylinder
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  #7  
Old June 27th, 2016, 09:53 PM
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Matthew
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Make sure to bench bleed that master if you replace it.
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  #8  
Old June 28th, 2016, 09:37 AM
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Chris
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Thanks guys. will look into the MC and leaks.
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