2006 LX Brake pedal slowly looses pressure at a stop

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Nov 14, 2010
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golden, co
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www.guthriealexander.com
I recently moved on from my 80 series and found a 2006 LX in great shape locally with 200,000k.

One thing I unfortunately did not notice test driving it is that the brake pedal slowly looses pressure while I am stopped at a stoplight. The cruiser brakes firm and fine otherwise. Coming to the initial stop both at low and high speeds feels fine and normal every time. Its only at a long stop that the pedal starts to fall.

Searching the forum I see the documented issues that are most commonly seen in 98's and 99's but I am not seeing anything for a late model LC/LX and I am not experience a complete loss of brakes. I would assume my culprits are a failing master cylinder or excessive air in the brake lines? Could a failing caliper also cause this condition?

No codes, lights or warning sounds, reservoir is full with no found leaks.

I am scheduled for 200k service at Slee at the end of the month that includes brake service, but I am wondering if this is something I should try and get addressed sooner especially if its predicates a larger issue or a future sudden failure.
 
Are you losing fluid? Failing caliper with that symptom would have fluid leaking. I would lean towards MC. Most service places will replace master cyl/pump assembly ( a few thousand $). I have a MC rebuild thread on here you might want to take a look at.
 
Are you losing fluid? Failing caliper with that symptom would have fluid leaking. I would lean towards MC. Most service places will replace master cyl/pump assembly ( a few thousand $). I have a MC rebuild thread on here you might want to take a look at.

Thanks Skidoo, I read your thread earlier and was hoping that was not the case, but its certainly worth the try to save not paying for a new MC. Thanks for writing it up.
 
That is the "A" typical master cylinder going bad symptoms.
 

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