Question about 1986 Ford F 350

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Relaced master cly and booster and brakes still go to the floor seem ok if you pump them

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  • gernlbithead May 11, 2010

    Does the fluid level in the mstr cylinder stay full and how is the vacuum to the booster?

  • Thomas May 11, 2010

    How are you bleeding the brakes?



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You have either air in the lines ( need to bleed brakes) or you the rear brakes are not ajusted up . the rear ajusters are not working because they are rusty or the ajuster cables are broken

Posted on Jun 04, 2009


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1 Answer

Ford taurus brakes ok but sometimes pedal power asist seems to cut out

vacuum leaks can make booster loose power assist. if pedal intermediately hard to push the booster might be bad. if the pedal goes to the floor and you dont have brakes might be the master cyl

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Brake problem

Ive seen in the Ford Escape the fluid leaks through the back of the master cyclinder so might take off the master cly. from the brake booster and look into the booster to see if there is fluid build up inside it. Could be the same problem here. worth looking into.

Dec 14, 2009 | 2004 Mercury Mountaineer

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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

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A few seconds after brakes are applied the pedal starts to fall to the floor. When I pump the brake pedal I here a hissing noise coming from the vacuum booster.

you have two problems here, your master cylinder has a leaking seal, the low pedal is resault, the power brake booster rubber diaphram is damaged and leaking from the brake fluid that is getting into it from the master cylinder, these are sold as a unit that has been rebuilt.

Sep 28, 2009 | 2001 Buick Century

1 Answer

I can't get brakes on my 2001 dakota ,the pedal goes right to the floor with little brakes. I've changed the master cly. and no difference. I've bled the system.there is something wrong with the front...

did you bleed the master cyl. before or during installation? bleed brakes in proper order?RR LR RF LF? does it have a power booster between master cyl.& firewall?check for vacuum to booster.when ABS isn't working you should still have brakes.suspect power booster diaphram.

Sep 21, 2009 | 2001 Dodge Dakota

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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

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Hard brake pedal on cadillac

Check the vacuum line that goes to the brake booster which is on the firewall behind the master cylinder. Good luck. Let me know if this helps please.

Apr 28, 2009 | Cadillac DeVille Cars & Trucks

1 Answer

No brakes

Check the Brake master pump......If the padle drops to the floor means The booter is ok,,,,! I think the Brake master pump has a internal leak.....Reply me.....

Sep 06, 2008 | 1998 Land Rover Range Rover

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check your brake booster vacuum pipe for leaks otherwise it sounds like your brake booster has failed

Jun 04, 2008 | 1986 Ford F150 SuperCab

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