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I have audi 80 1995 cabrolet the brakes not working properly when i press the pedal it flooring i have to pump it to have a pressure on the brakes?

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Sounds like air in the hydraulic lines. Probably need to blead the entire break system

Posted on Oct 02, 2010

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Jeep brakes


It is very difficult to diagnose this problem with the little bit of information you gave. If the brakes are drum brakes check to see if the brake cylinder is working and has no leaks, lift the rubber seals and make sure there are no leaks there, check the brake adjuster make sure that works okay. If everything works and you bled the brakes properly, then the problem is most likely is the master cylinder or the wheel cylinder.



While bleeding the brakes always make sure you check the master cylinder reservoir to make sure the fluid level is up so you do not get air in the brake lines. When bleeding the brakes did you have someone press down hard on the brake pedal hold the pressure on the brake pedal when opening the bleeder then push the brake pedal to the floor keep it there, until you tightened the bleeder, then pump the brakes up and hold it there, while you repeated the bleeding operation by opening the bleeder when the brake pedal go\'s to the floor keep the pedal down until you tighten the bleeder and then pump the brake pedal back up then check the fluid level in the reservoir, keep doing it until the brake fluid shows no sign of air.



If the brake pedal is pumping up during the bleeding process and you made sure you got all the air out of the brakes and then the pedal go\'s to the floor, make sure the fluid level is correct in the reservoir and the bleeder is closed tight and there are no leaks in the lines, wheel cylinder, brake cylinder the brake adjuster is working and master cylinder, and if you still have no brakes then it must be a defective piston in the wheel or brake cylinder, if there is a seal problem with the pistons you will not get any pressure to push the brake fluid. let me know how you are doing.

May 29, 2014 | 1990 Jeep Wrangler

1 Answer

LOSING PRESSURE WHEN I PRESS BRAKE PEDAL, BUT NO OUTSIDE LEAKS


check the brake pads. When they start to wear down, they can have extra play in the pedal causing you to have to press further or pump them. If they are still loosing pressure, check the fluid levels and check again for leakage all through the lines, both front and back.

Jan 23, 2012 | 1999 Volkswagen Passat

1 Answer

My brake pedal goes all the way to the floor


Brake pedal goes to the floor? When does it happen. That is the most important piece of information. Most brake systems are power assisted via vacuum from the engine. Your brake booster is what makes the "power assist" work. There are some specific times when you will feel your brake pedal "fade" to the floor and it is normal due to the cycle of the brake components operation.If your brake pedal goes to the floor every time you step on it, stop driving and get to a repair facility! If the pedal is working when driving and the vehicle seems to be working as it always has, then chances are there is no concern. To be on the safe side, have it checked the next time you are in for any other type of service.There is a sensor inside most brake reservoirs that activates the indicator light in your instrument cluster when the level is lower than it should be. As your brake pads wear down, the system requires more fluid so the level at the reservoir drops setting the light. Same thing if there is a leak. The fluid level drops and the light goes on. This brake fluid leak would most likely be combined with a spongy pedal or a pedal fade every time you step on the brakes. A leak would also almost always have a wet area around the leak. Sometimes the leak can be internal to a part of the car you cannot see, so don't count on it.One easy way to check most brake boosters and the brake system for leaks is to turn the vehicle off and pump the brake pedal. Every time you depress the pedal you should feel the pedal "height" come up and the pedal get harder. After a few firm pumps of the pedal, hold it down. Leave pressure on the pedal for 20 seconds or so. Does the pedal move slowly (or quickly) to the floor? If so then there is a leak somewhere in the system. Keeping pressure on the brake pedal, start the vehicle. Does the pedal no drop? It should. That is the power assisted vacuum kicking in as the engine starts to run.The bottom line is that we are talking about your brakes. Your life, your passengers lives and the lives of others on the road around you depends on that system working properly. If you have any doubts, or feel uncomfortable, take it in to have it looked at. Know specifically what it is doing so that you can have your repair facility look at what you are feeling and tell you if

Oct 29, 2011 | 1987 Nissan Pickup

1 Answer

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

How do i bleed the brakes on a 99 ford expedition?


on the brake calipers ther is a bleeder screw. It looks like a grease fitting.1) fill brake fluid 2) have a helper pump the brake pedal ( vehicle not running ) 6 - 8 times to the floor and release then press pedal to the floor and hold with foot pressure pressing down. 3) at this time loosen the bleeder valve and the pressure and air will release,( do not allow brake pedal to release or come up, continue to hold to the floor ! ) after pressure and any noticeable air bubbles and no more fluid comes out then this is the time to tighten or (close ) the bleeder screw. 4) continue this process untill no visable air bubbles are present, IT IS VERY IMPORTANT THAT YOU CHECK THE BRAKE FLUID RESERVOIR AFTER TWO BLEEDINGS AND FILL AS NECESSARY ! 5) Continue the procedure on the opposite side. Do the two front wheels and the rear wheels as a pair as the brake system is a two part system, FRONT & REAR

Jan 17, 2011 | 1999 Ford Expedition

1 Answer

I have to press very hard to get the brakes to work. If i pump the brake pedal the brakes seem to work better for that application, but I still have to press very hard on the pedal to get the brakes to...


I suggest replacing the master cylinder assuming that you bled the system properly. You sound competent so it seems likely that the seals in the MC might be failing. That being said the brake lines can hold a lot of air :)

Aug 23, 2010 | 1993 Toyota T100

1 Answer

99' Audi A6 2.8 Q no brakes, low to no pedal pressure...


Not likely the ABS pump there is something wrong with the mechanical brakes it sounds like the emergency brake is not adjusted try adjusting the rear cable first then pull the emergency brake and push your foot on the brake if it is still to the floor you have a problem with a cylinder or a mechanical adjustment, if it's higher with the E brake on then you have the adjusters not set right and the cables not adjusted, So adjust the cables first. If the brakes are spongy with the engine off then it will need to be power bleed if that does not fix it then you may have the wrong brake shoes or pads on the car. Did you install the plates in the wheel rotor front braes? If not you lose 1/4 inch travel on the from pads, if the basic brakes are not right the ABS side is not going to be right so those problems have to be dealt with first. Also DO YOU HAVE A POWER ASSIST BOOSTER IF SO IT COULD BE BAD, TO TEST HAVE SOMEONE STEP ON THE BRAKE PEDAL AND PULL THE HOSE OFF THE BRAKE BOOSTER IT'S behind the master cylinder (sorry for the caps) if you don't here a suction sound when you remove the hose then you have a bad heck valve by the booster connected to the hose that plugs into the booster. if all of this is ok then it may be the ABS booster but normally its a bleeding problem. write a comment if this does not help or you need another lead,

Jun 19, 2009 | 1998 Audi A6

1 Answer

Brakes


The brakes just need to be bled properly which take 2 people or a bleeding pump,Please tell me how you are bleeding the brakes.

May 17, 2009 | 1998 Audi A4

1 Answer

Clutch pedal goes to the floor on A6 2.8 P 1997


It's a hydraulic system on the Audi. Using a master cylinder (nearer pedal and firewall) and a slave cylinder (at clutch release bearing itself, or on side of tranny. Owner's manual should give location for a reservoir to check. Similar but smaller than brake master cylinder reservoir if that helps. The system uses brake fluid, and you either have a leak, a lack, or a loss of this fluid, and/or pressure to the clutch. Sounds like you need qualified service, these systems need REAL diagnosis before you start buying parts. ALso can be hard to bleed completely free of air after parts are installed.

Jan 27, 2009 | 1997 Audi A6

1 Answer

Audi A3 diesel 2000 reg brake pedal going to the floor with engine running and heavy pedal pressure


you should have bench bleed the master cylinder first before installation return cylinder and get a new one than bench bleed it first than install it to car once installed you may have to bleed each wheel

Jul 06, 2008 | Audi A3 Cars & Trucks

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