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Discussion Starter #1
Hi All
I have just replaced the brake m/c, Booster, flex lines, and rebuilt calipers on my 90 spider quad. All went well until I bled the last caliper and the pedal did not return fully. I couldn't move it back with my hand. this morning the pedal is back and is firm.
while bleeding there was a sound coming from the booster that reminded me of a whoopee cushion.
Looking through the workshop manual it looks like I should check the "no return valve". I thought the plastic fitting on the booster checked the vacuum but inspecting the old booster it looks like it is just a fitting for the vacuum line. Can anyone tell me where the "No return valve" is located so I can check and see if that is the problem.
Anyone have any ideas what I should check? They seem OK today but being that it's the brakes I would like to be thorough!
 

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At least on L Jet and earlier cars, there is a one-way valve where the vacuum line comes off the intake manifold. I can't say specifically on a Motronic car. Can you post a pic of the vacuum hose take-off at the intake?

Andrew
 

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Follow the hose from the booster to the intake. Were the hose is connected is the valve.
 

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But Mad North-Northwest
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The valve is basically only there to hold vacuum in the booster so you still get brake boost if the engine dies. If it fails I don't think it'll cause the issue you're describing.
 

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Discussion Starter #5
Thanks everyone for the help! It looks like it is part of the intake manifold. I checked the valve and checked it all is well. I'm not sure what the sound was but the booster is working and brakes are solid. Now all I need is nice weather!
Andrew and Tom I hope you made out OK with all that rain you've had!
John
 
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