d*** these brakes
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Joined: Oct 2011
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d*** these brakes
i have a 1993 e-350 ambulance. im getting a "rear abs" light. my breaks are very stiff. ive replaced everything except lines,master cylinder, and the proportioning valve.
i have a vacuum pump that runs accessories and the brake assist. i have 20" of vacuum until i connect the brake assist then i have 0". im guessing that i have a bad master but the brakes work fine they are just stiff.
the reason im posting this is due to my rear brakes smoking.
i have pulled my codes which are 27,62,67. and none have to do with my breaks.
has anyone had this problem?
i have a vacuum pump that runs accessories and the brake assist. i have 20" of vacuum until i connect the brake assist then i have 0". im guessing that i have a bad master but the brakes work fine they are just stiff.
the reason im posting this is due to my rear brakes smoking.
i have pulled my codes which are 27,62,67. and none have to do with my breaks.
has anyone had this problem?
Posting Guru
Joined: Feb 2007
Posts: 2,351
Likes: 8
Master cylinder might be fine, suspect a leaking vacuum booster.
IMO "rear brakes smoking" IS NOT "fine".
By "my breaks are very stiff" I presume you mean the brake pedal is "stiff" i.e. hard w/little travel? With no vacuum assist the brake pedal can feel hard. Dragging rear brakes overheat & can boil brake fluid, or any water inside, creating pressure, binding the brake shoes even more. Shoes need to retract, could be an adjuster problem? Without retraction pedal feels hard.
IMO "rear brakes smoking" IS NOT "fine".
By "my breaks are very stiff" I presume you mean the brake pedal is "stiff" i.e. hard w/little travel? With no vacuum assist the brake pedal can feel hard. Dragging rear brakes overheat & can boil brake fluid, or any water inside, creating pressure, binding the brake shoes even more. Shoes need to retract, could be an adjuster problem? Without retraction pedal feels hard.
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