Question about 1997 Dodge Caravan

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Brakes hi!changed master cylinder.bleed brakes.work ok for a few days.then no left front brake ,needs to e bleed again,ok a few more days then again no left front brake .can you help?/? thanks tony

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  • greatbass Jun 12, 2008

    hi

    have ABS ,need scanner but no comunication from scanner,

  • greatbass Jun 13, 2008

    hi

    no leaks,everything normal ABS works fine

    will see how it works out



    thanks

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Did you have this problem before you replaced the M/C? Inspect your brake system for leaks, especially the rubber hoses. Make sure all fittings are tight. Sometimes the caliper's seal around the piston will allow air to **** in, but won't leak fluid. Many cars from the 80's onward had pistons made out of plastic which causes a sticking and leaking problem. Many times rebuilt, loaded with pads, calipers cost just a little more than what a reseal kit costs. They have to be cutting corners somewhere.

If your vehicle has ABS, sometimes you have to hook a scanner up to bleed the brakes correctly. If you don't have ABS, you probably have a proportioning valve and these can cause trouble, especially on a high mileage vehicle.

Posted on Jun 11, 2008

  • Dan Shay Jun 12, 2008

    If you have no communication using the scanner, check your power supply to the ABS computer. Does the ABS warning light come on and stay or does it come on at all? If it comes on and then cycles off, system is normal. If it doesn't come on at all, you have a problem with the ABS computer.

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1 Answer

The front drivers side break keeps locking. I have replaced the caliper and now when I pump it no fluid is coming out from the line.


Did air get into the master cylinder? If you can, try bleeding the master cylinder. The fact that you aren't getting any fluid out of the line suggests that the master cylinder isn't pumping fluid.

Master cylinders are (usually) on a split circuit system - that is, the front left brake is on the same line as the rear right. The front right brake is on the same circuit as the rear left.

A point to be aware of is when bleeding brakes/doing brake work and if the master cylinder runs dry, is that a seal inside the master cylinder can fail/twist over and not pressurise that particular line, even though it may pressurise the opposite brake line.

I'm in the UK. I have a 1998 Jeep Grand Cherokee 4 litre, which I am slowly rebuilding. Three weeks ago I fitted new front brake rotors, new front callipers and pads. I've been rebuilding cars for over 40 years now and have done countless brake overhauls.

.. and could I get a hard pedal after the job was completed? I must have bled the brakes three times a day for a week and couldn't get a brake pedal. I phoned a full time mechanic I know - he came and tried to bleed the brakes three times and couldn't get a hard pedal.

That's when you think 'The master cylinder was working before I started the job so it must be still working now'.

I fitted a brand new master cylinder and because some parts for older jeeps are hard to come by in the UK, I fitted a second hand proportioning valve. When I bled the brakes again the pedal became rock solid. Fixed.

You're probably fed up with your braking problem now ... and apparently this 'no fluid/brake pedal' is more common than you may think.

Try bleeding the master cylinder if you can. If you suspect that it isn't fully working - try an overhaul kit which is cheaper than a new master cylinder.

As for changing the proportioning valve .. that's your decision. My brakes now work though the truth is I don't actually know which was at fault as I changed both the master cylinder and proportioning valve at the same time. Maybe both were at fault, for whatever reason. I genuinely don't know.

The positive aspect is that you are doing your own work and know what you're doing. You're saving on labour charges.

Apr 18, 2016 | 1998 Dodge Grand Caravan

1 Answer

Brake pedal to floor


first did you perform a bench bleed on the master cylinder? if not bench bleed the master cylinder. had a neighbor with a similar problem with a ford truck. did some reaserch and found the ABS system needed to be bled. one way to bleed air out of it is to connect the diagnostic computer and perform an ABS bleed and then bleed the brakes like you normaly would. The other way was to take the vehicle somewhere you can slide around safely and slam on the brakes causing the ABS to activate. do this a few times and then perform the normal bleed method.

Jan 17, 2013 | 2006 Kia Sedona

2 Answers

My brake pedal goes all the way to the floor there is no any brake oil leak i replace the brake master cylinder i bleed the system but still the same what is the correct procedure to bleed brake system...


fill master cylinder, start at right rear. the way I do it is make sure cap is back on master cylinder. pump the brakes a few times then hold them. have another person open the bleeder valve at the tires until brakes go to floor. hold them down until bleeder is retightened but be sure master cylinder is not out of fluid. then go to left rear and do the same procedure, then right front, then left front. check fluid and if air is all out there should be brakes. good-day ! THIS IS HOW I HAVE ALWAYS DONE IT ! heres a little trick of sorts. you can change a master cylinder, and if you bench bleed it first. and no fluid is lost from the master cylinder lines you do not need to bleed the whole system. but make sure cylinder is full of fluid before putting on vehicle and all air is out of master cylinder.

Oct 23, 2011 | 1997 Ford Expedition

2 Answers

Brakes go to floor changed master cylinder to no avail still to the floor


ok there are a few things you need to check.. you said you changed the master cylinder.. did you bleed the braking system after???

  • remove from wheel,,
  • locate bleed valve on caliper / or unscrew one of the lines
  • pump brake and push right down and hole,,
  • repeat plugging the lines with your finger ,,
  • repeat the above 2 steps a few times
  • tighten the bleed screw while holding the brake right down..
if that fails ...

if that fails try adjusting the brake up.. its on the rear tires,, remove one and them remove the shield protecting the brake shoe,, see the turn bolt that adjust the pistons,, adjust that a bit until the brake is in the desired position..

check your disc pads to see if its wron out..

check your booster / change it..

Apr 23, 2010 | 1989 Mazda 626

1 Answer

I am having trouble bleeding my brakes on a ford courier there is no pedal there when i have bled the brakes and i have also tryed changing the master cylinder and it is the same


Start by bleeding master cylinder, will take two to do this, have some pump the brake paddle about ten time every time, have them pump it and hold it down while you open brake line when paddle goes to floor close and pump again ( one of the brake lines at the master cylinder ), keep doing that till no more air comes out, then do the other brake line at master cylinder again till no more air comes out, keep an eye on master cylinder that it don't go low on brake fluid or you will have to start all over again, how go to right rear wheel and bleed till no more air comes out ( have them pump brake paddle and hold while you open and close bleeder valve, do not let them release brake paddle till you have close bleeder valve, keep doing that till no more air comes out, then go to right rear, then left rear, from there right front and last left front.Hope this was very helpful, good luck.

Jan 28, 2010 | Ford Escort Cars & Trucks

1 Answer

Hi there.... i just changed a brake line... i


fill up the master and leave the cap off. open up all the bleeders. allow to sit for 5-10 minutes. hopefully, it will start to gravity bleed. after this, close up all the bleeders and try again. sequence: right rear, left rear, right front, left front. it sounds as if you just have an excessive amount of air and it can sometimes be difficult to bleed. you may need to repeat this process several times.

Jan 25, 2010 | 2000 Chevrolet Cavalier

4 Answers

Front brakes lock up causing hot and smoking front brakes.


This sounds like the master cylinder isnt releasing pressure I would change master cylinder.

Jun 15, 2009 | 1997 Chrysler Town & Country

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

2 Answers

Changed brake pads! Success.. Now I need to bleed the brakes.


To bleed you brake system, you will need brake fluid, a jar, and a couple feet of small hose that fits tightly on the bleeder screws. You should not need to remove the tires to access the bleeder screws, but you may need to raise the vehicle a bit to access them.

To bleed the system, start with the right rear wheel. Put a couple inches of brake fluid in the jar, attach the hose to the bleeder screw, put the hose in the jar of brake fluid, then open the bleeder screw. Once the bleeder screw is open, pump the brake several times. Next, close the bleeder screw. After you close the bleeder screw, remove the hose and jar, then fill the master cylinder with brake fluid.
Repeat the steps going to the left rear second, right front third, and left front last.

Once you have bled the system your brakes should be tight and working nice.

I hope this information helps you, and I wish you luck on your repair.

May 10, 2009 | 1995 Mercedes-Benz S-Class

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