Brake Trouble
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Honda-Tech Member
Joined: Nov 2004
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From: St. Paul, MN
Brake Trouble
i have a vehicle that has a pedal sinking problem..
it only does it sometimes.. it sinks to the floor.. i replaced the master cylinder and still does the same thing.. is it most likely the booster???>.. what does each perform??
it only does it sometimes.. it sinks to the floor.. i replaced the master cylinder and still does the same thing.. is it most likely the booster???>.. what does each perform??
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Joined: Aug 2008
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From: Houston, TX, USA
Re: Brake Trouble (93b20z)
brake boosters don't go out all it does is push a pin into the master cyl you replaced. check all your bleeder screws to see if their all nice and tight. and check all your lines to see if you have a leak. if all is good than it has to be you need to bleed them in the correct sequence. take it to a brake specilist. they do it less than $40.
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Joined: Apr 2007
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From: Seahawks WA, USA
Re: Brake Trouble (93b20z)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 93b20z »</TD></TR><TR><TD CLASS="quote">i have a vehicle that has a pedal sinking problem..
it only does it sometimes.. it sinks to the floor.. i replaced the master cylinder and still does the same thing.. is it most likely the booster???>.. what does each perform??</TD></TR></TABLE>
re-bleed the brakes in the correct sequence starting at pass rear, then driver rear, then pass front then driver front. always start farthest away from the master.
it only does it sometimes.. it sinks to the floor.. i replaced the master cylinder and still does the same thing.. is it most likely the booster???>.. what does each perform??</TD></TR></TABLE>
re-bleed the brakes in the correct sequence starting at pass rear, then driver rear, then pass front then driver front. always start farthest away from the master.
Junior Member
Joined: Oct 2007
Posts: 143
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From: Frankfort, Illinois, United States
Re: Brake Trouble (93b20z)
I have a similar problem in my sol. I noticed it mostly sinks when i turn around. its like a caliper or two just dont work and pulls when the pedal sinks. I also replaced th m/c. Hope you find an answer. ha ha
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Joined: Aug 2007
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From: Carroll County, MD
Re: Brake Trouble (kidwit93delsol)
Another thing to take a look at is to make sure you don't have even small leaks in your calipers/wheel cylinders (if applicable). I had one wheel cylinder go bad on me last week when I replaced my shoes, went to the floor every single time unless I pumped the brakes.
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Honda-Tech Member
Joined: Nov 2004
Posts: 144
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From: St. Paul, MN
when i replaced it.. i did this...
bench bleed the master...
bled it in sequence of course..
and still no good i'll check for leaks... i give an input if this problem is solved
bench bleed the master...
bled it in sequence of course..
and still no good i'll check for leaks... i give an input if this problem is solved
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Joined: Oct 2005
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From: State College, Pa, US
Re: Brake Trouble (93b20z)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 93b20z »</TD></TR><TR><TD CLASS="quote">i have a vehicle that has a pedal sinking problem..
it only does it sometimes.. it sinks to the floor.. i replaced the master cylinder and still does the same thing.. is it most likely the booster???>.. what does each perform??</TD></TR></TABLE>
Brake booster uses engine vacuum to multiply the force you apply to the mc
http://www.howstuffworks.com/power-brake.htm
Master cylinder is a hydraulic cylinder that give two brake circuits
http://www.howstuffworks.com/power-brake.htm
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 93egSLEEPER »</TD></TR><TR><TD CLASS="quote">
re-bleed the brakes in the correct sequence starting at pass rear, then driver rear, then pass front then driver front. always start farthest away from the master. </TD></TR></TABLE>
This is not the correct way to bleed the brake system. It is the RR then Lf then LR followed by RF. On modern cars the front and rear brakes are tied together through a criss cross x pattern. You start with the caliper furthest from the master cylinder then bleed that loop. Once that loop is done then you do the other starting at the rear of the car again
Edit: also when a brake booster fails they tend to cause the pedal to become almost impossible to press
it only does it sometimes.. it sinks to the floor.. i replaced the master cylinder and still does the same thing.. is it most likely the booster???>.. what does each perform??</TD></TR></TABLE>
Brake booster uses engine vacuum to multiply the force you apply to the mc
http://www.howstuffworks.com/power-brake.htm
Master cylinder is a hydraulic cylinder that give two brake circuits
http://www.howstuffworks.com/power-brake.htm
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 93egSLEEPER »</TD></TR><TR><TD CLASS="quote">
re-bleed the brakes in the correct sequence starting at pass rear, then driver rear, then pass front then driver front. always start farthest away from the master. </TD></TR></TABLE>
This is not the correct way to bleed the brake system. It is the RR then Lf then LR followed by RF. On modern cars the front and rear brakes are tied together through a criss cross x pattern. You start with the caliper furthest from the master cylinder then bleed that loop. Once that loop is done then you do the other starting at the rear of the car again
Edit: also when a brake booster fails they tend to cause the pedal to become almost impossible to press
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