Question about BMW Cars & Trucks
55 reg bmw 730 brek pedal goes hard and break does not work what it could be
Posted by Anonymous on
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Posted on Jan 02, 2017
SOURCE: hard pedal low stopping power
Poor braking may be due to severely worn pads (disc brakes) or shoes (drum brakes), however, a common cause of "sudden" hard braking is the power brake booster either losing vacuum or failing, causing the brake sytem to lose the assist the booster provides and requiring a stronger effort by the driver to slow or stop the car by "standing" on the brake pedal with much greater force.
Posted on Jul 19, 2008
SOURCE: pedal goes to floor on 92 F250
I would strongly recommend checking your trucks R.A.B.S. (Rear Antilock Brake System) valve . It is located on the left frame rail just under where your left foot would rest . They can leak internally and exhibit the problems you are describing (loss of pedal , with no fluid loss) .
It is highly unlikely that a power booster would cause this , as a failed booster will show itself in these ways . 1) a hissing sound when you apply the brakes (indicates a vacumm leak) 2) rough engine idle/stalling when brakes applied (also indicates a vacumm leak) or 3) No power assist (brake pedal hard to push) .
If you do discover your hydraulic problem is in your RABS valve , don't forget to bleed it ,(there is a bleeder valve on it) and the rear brakes again after you replace it .
Hope this helps
Posted on Feb 06, 2009
Is the engine also running poor such as tries to stall or the RPM is high? Is there an unusual suction type sound? Check the vacum hose to the brake booster, if loose, cracked or a hole in it.
This is about a 1/2" diameter hose and goes to the booster from the engine for power brake assist.
Posted on Mar 22, 2009
Possible causes for this check engine light code include:
Blown oxygen sensor fuse
Open circuit in oxygen sensor harness
Open circuit internal to oxygen sensor
Open circuit in PCM
Short circuit in oxygen sensor harness
Short circuit internal to oxygen sensor
Short circuit internal to PCM
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Posted on Jun 04, 2009
SOURCE: Hard break pedal
there is a bulletin in ford motor company about a vacuum hose from de brake system this hose dosn't have clamp and the new has it you need to take your mark lt to a dealer. you can see the hose under the truck beside the TR sensor a litte upper. sorry my english is bad
Posted on Aug 04, 2009
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