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Got brake pressure but after first pump it goes

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You have air in the line,may just need bleeding,if fluid is low-low then you may have a leak,if you have drum back brakes,your wheel cylinders could be leaking,also you may just need front brake pads.Check all wheels for leaks.

Posted on Jan 14, 2013

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1992 F250 460 cid automatic 2w drive 85000 mi. Just replaced my master cylinder, all 4 brakes, and both front rotors. Afterward I blead the brakes and got bubbles out of fluid. Problem is : when not...


There is never a test or reason to pump your brakes

Accomplishes absolutely nothing.

There is no pressure in a braking system at all,
until you SLOWLY apply the brake pedal.

Then less than 1" off movement in the master cyl,
will develop 600 to 1800 lbs at the wheels

Release the brake pedal, the system goes to zero,
IT DOES NOT HOLD ANY PRESSURE

To answer your question

You not suppost to press the pedal hard
The saying goes--you apply the brakes,
not force the pedal arm and pin into the
vacuum booster, as though you want to damage it

When your driving what happens ?
You have higher manifold vacuum and
thus your pedal is normal,why the VACUUM
brake booster

Mar 31, 2011 | 1992 Ford F250

1 Answer

I have a dodge caravan that has the ABS and the BRAKE light on the pedal is rally hard but it goes away once in a while for like a day and all over again


Dodge used an ABS system for 2 years that didn't have a vacuum booster. Instead it used ABS pressure from the pump motor for the power brakes. This is the system you have. The ABS pump is mounted on top of the transmission. Is the pump running when the pedal is hard to push? Sometimes the pressure sensor in the ABS module will go bad and the pump won't run. You will get a hard pedal and the ABS light and the BRAKE lights will be on. The code in the ABS control module will be LOW BRAKE ACCUMULATOR PRESSURE.

Mar 04, 2011 | 1993 Dodge Caravan

1 Answer

Brake peddle goes all the way to the floor. brake peddle will have pressure when the car is off, but when you turn it on brake peddle loses all pressure. how can i tell if its the master cylinder or the...


first make sure there are no brake fluid leaks, sometimes the steel lines get rotted and start leaking. to test the booster with the engine off pump brake pedal about 10 - 12 times on the last pump hold the brake pedal down and start the car if the booster is good the pedal will drop alittle.

Feb 02, 2011 | 1994 Oldsmobile Cutlass Ciera

1 Answer

Brakes


It could be your power steering pump not building pressure in your brake booster or your master cylinder which is where your fliud goes. Try flushing the system and check for leaks and restrictions

Jul 29, 2010 | 2000 Ford Focus

1 Answer

I have a 1995 chevy astro van and the breaks and steering have lost power. The fluid's are full, and I can not detect any broken lines. What could it be?


Your van don't have the regular air (vacum) power brake booster, your has a hydraboost brake booster, which is power by your power steering pump, if power steering pump goes bad you will not have power steering or brakes, brake peddle will feel very hard and will take alot of pressure on the brake peddle to stop your van, more the likely your power steering pump is bad.

Jun 29, 2010 | Chevrolet Astro Cars & Trucks

1 Answer

Brake pedal goes all the to the floor. can not


Check the reservoir to be sure the fluid is full. If not, top it off and try it again. If there's still trouble building pressure, pump the brakes a bunch of times, and then check around each wheel for fluid on the ground. If you see none, it's possible that you have a break in the line somewhere through the chassis and that the fluid is leaking out inside. If you see no evidence of leakage, and the reservoir is still full, you need a new brake master cylinder - what will have happened is that the diaphragm around the plunger inside the master cylinder (which moves through the cylinder when you push the pedal, and forces fluid out to the wheels) has a hole or tear in it, so instead of pushing the fluid out to the brakes, the plunger simply moves through the fluid. It never builds pressure, and your brakes don't work.

Dec 22, 2009 | 1992 Cadillac DeVille

2 Answers

1990 Trofeo .. brakes pedal goes hard .. loss of power brakes. Fluid is up and I can't find any leaks


There are two things to look for regarding this problem. You have the "teves" ABS system, as do I in my 1989 trofeo. They were NOT that good, and tend to be somewhat trouble--prone. I DID have the same problem you do, mine was the ABS pump relay. There are two brake system relays mounted on the firewall of our cars, near the center, above the A/C blower motor. One is for the pump--the other one is for the whole brake system. If the pump relay goes bad(due to it running too much, from a "bad acumulator" which I DID have--and you probably do too..), it will not turn on the brake pump, and if the acumulator is either bad, or discharged...you will NOT get ANY power assist at ALL!! Our cars do NOT use vacuum brake assist--it is ALL done by the hydraulic pressure, stored in the accumulator. The relays are only about 10 each, and not hard to get. Another somewhat possible problem is the brake pressure switch, which triggers the pump relay, and it sometimes goes bad. If so, it causes the same problem as the relay. It is on the brake master cylinder assembly, and has about 4 wires or so on it

Also...you may have a bad accumulator. This is the ball--shaped thing on top of the master cylinder.It stores brake pressure, between pump runs. If it goes bad but the pump still works...you WILL have brakes, but SOMETIMES...the pedal will be hard at first, and then work. They go bad after some years of use, and mine was bad. A new one is available from GM, for about 150.

Once these "sore spots" are taken care of...the Teves system DOES work nice, and stop quick. Just have someone check these things that knows what they are doing. Good luck with your Trofeo--I love mine.

Jack.

Sep 29, 2009 | 1990 Oldsmobile Toronado

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

1 Answer

Power steering pump connections high and low pressure outputs


top rear most line comes from the pressure regulator, rear side outlet at angle line goes to oil cooler then to fluid reservoir. Smallest of all three lines is a pressure line that goes to the rear self leveling system.

Jun 16, 2008 | 2006 BMW 750Li

2 Answers

Brakes


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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