Question about 1995 Honda Accord

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Braking pedal slowly to the floor,sometimes can pump back up, no visible leaks, master cylinder full. Could this be a master cylinder or booster problem?

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Take the top off the master cylinder and while someone is pushing the break pedal down, looks for bubbles coming up in the master. Master cylinder probably needs rebuilding or replacing.

Posted on Jun 29, 2008

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3 Answers

Even after replacing front and rear brakes, the pedal goes nearly to the floor (but does stop the vehicle). What do I need to do


Brake booster has gone bad or u have a vacuum leak. Check the seals for leaks around booster where the. Fluid goes in the plastic holder. Check for vacuum leak going to break booster

Apr 15, 2015 | 1999 Plymouth Breeze

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Brake pedal goes to floor when first applied. Fluid within limits. No signs of leak(s). Hissing sound noted. No vibration.


Hissing sound indicates booster diaphragm has torn. Please let me know if you would like instructions for replacing the booster.

May 28, 2011 | 2008 Toyota RAV4

3 Answers

99 ford explorer brake pedal goes to floor. Booster or master cyl. ?


Not likely that the booster is an issue. The booster would not be able to overcome the brake fluid compression.
First open and inspect all brakes for leaks, adjustment, etc. Check all brake lines.
So if no leaks, did the fluid go low in the MC? If so, pad consumption would eat more than a MC reservoir of fluid, and not require MC replacement, but rebleeding and top up of fluid. If the pads are worn, and you replace them, often this will expel air back through the MC.

If you determine the MC is faulty, bench bleed the new one before install, or you will have lots of problems getting air out....

Mar 03, 2011 | 1999 Ford Explorer

8 Answers

Changed calipers rotrs pads still no brake presure wont pump up to bleed air out of lines could master cylinder or booster be bad


Booster is okay, you have to bench bleed the MC, first. So, since it is installed, bleed it with a kit from the parts store, little plastic hoses screw in to the brake hose fittings, and put other end under fluid in reservoir. pump slowly, especially wait at end of release, for fluid to refill piston chamber....pump until no bubbles...

FROM THIS POINT you must not allow fluid in reservoir to go low, or start all over again....

Now bleed the brakes and you will eventually get pressure.

Mar 01, 2011 | 1998 Dodge Neon

1 Answer

Install new brake pads and rotors all 4 wheels. Replaced front 2 calipers. Bled brakes. New clean fluid coming out. pedal is still soft and goes to floor. 200 Seebring.


Are you losing any Brake Fluid? Is it visible anywhere at the four wheels? Is it visible anywhere else?
The Master Cylinder may be defective. When you bled the Brakes did you maintain proper Brake Fluid Level in the Master Cylinder? If you didn't: and air entered into the Master Cylinder there maybe air within in the system in the Master Cylinder. You can bleed the Master Cylinder by removing the brake lines, adding more fluid, pumping the brakes, bleeding the air out of the system.
Are you losing Brake Fluid and can't find a noticeable leak? Then there is a good posibility that the rear seal in the Master Cylinder is leaking and the Fluid is going into the Brake Booster - which is the large wheel shaped drum located on the fire wall. In this case both the Brake Booster and the Master Cylinder will have to be removed and replaced. The Booster contains seals that Brake Fluid is very caustic to and will ruin these seals- causing future failures.
If no Brake Fluid is lost, no leak found: Check the Brake Booster Vacuum Advance. This should be connected to the outside of the Booster, attached to a hose, with the hose going to the engine. Check to see if this is working properly. Replace if needed.

Dec 31, 2009 | 2002 Chrysler Sebring

1 Answer

Replaced Master Cylinder and Brake Booster on 03 Bravada and pedal still drops all the way to the floor instead of stopping at half-way of pedal travel? No visible leaks in hydraulic system but it acts...


Did you replace the master cylinder and booster because of this? If so then did this problem follow any maintenance done on the brakes? Was there any leaks prior to the replaced parts?
The pedal dropping to the floor with no leaks would point to items you have already replaced or air in the brake lines. Normally though this follows a break job.

It could be that you had a bad master or booster and the brakes were not properly bled after their replacement. This could seem like the same problem but with different sources.

This may seem obvious to some to bleed the system after any work but even if you did this already you should do it again. Bleeding air from the master all the way to the rear cylinders takes quite a bit of time.

Hope this helps but if not please let me know the answers to the questions at the top.

Dec 14, 2009 | 2002 Oldsmobile Bravada

2 Answers

Brake pedal still goes to floor 2000 GMC Jimmy


It's very possible to be the master cylinder, the o-rings on the piston could be worn, letting the fluid seep back through instead of getting full pressure through the lines. Could also be the brake booster.
Try changing the master cylinder first, which is cheaper and easier, and see if there is a difference, you'll need to bleed the brakes again.
To check the booster,
With the engine off, pump the brakes until the pedal is hard, then hold pressure on the brake pedal and listen for air escaping, or the pedal goes slowly to the floor, Do that after the master cylinder has been changed, at least that will be eliminated.

Sep 15, 2009 | 2000 GMC Jimmy

2 Answers

I have a 92 chrsy. 5th ave with no antilock brakes. just base brakes with rear drums. replaced master cly. due to leaking and replaced all the brake lines and hoses. i have good streams of fluid from all 4...


When you bleed the brakes are you starting with brake furthest from the master cylinder? Also was the master cylinder bench bled? If everything there is okay and you are not getting any air in fluid stream, you could try bleeding the brakes by having some one slowly pump the pedal till it is firm. Then have them let off open first bleeder valve and slowly depress to floor and hold there untol the valve is closed. repeat this at all bleeders. You may want to have car running to do this. Try this and let me know.

Jul 02, 2009 | Chrysler New Yorker Cars & Trucks

1 Answer

Brake system or booster


is your pedal hard to push? if so maybe booster. does your pedal slowly drop all the way to the floor? if so definately the master cylinder (leaks internally)

Apr 07, 2009 | 1996 Toyota RAV4

1 Answer

96 Taurus brakes


Presuming you have NO leaks in the hydraulic system,it would be a bad brake master cylinder.What's happening is,the piston inside the master cylinder has rubber seals,and when the pedal goes to the floor,the master cylinder is leaking internally,past the rubber seals.If the brake booster was bad,the symptom would be an extrememly HARD,unresponsive,brake pedal,and the engine would idle terrible (vacuum leak).Good luck.

Jul 10, 2008 | 1994 Ford Taurus

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