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I bled my breaks several times and still do not get it 2 work. I was told maybe the proportion valve is not working. I need 2 no how many proportion valves are there on my 97 nissan pathfinder?

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  • Nissan Master
  • 2,770 Answers

One...

Most likely not your problem. Ideal bleeding frequency is 3 years
in ordinary climate... & normal circumstances.

Fording steams is not NORMAL CIRCUMSTANCES...!!

Brake fluid and car finishes DO NOT mix well at all.
If you drop brake fluid on your paint... It will wipe away most paints in the blink... Gently flush with water and leave it COMPLETELY ALONE until you have had a serious talk with your local paint shop... weeks later.

Pressurized BRAKE-FLUID is an ABSOLUTELY
horrendous idea to me... Two friendly co-operative PARTNERS
is the only real safe bleeding method... If you like to squabble buy two extra 8 ounce cans of fluid for every anticipated squabble.

Have your peddle person ready to pump and hold... on command
and when they are ready to say "HOLDING".

EXPECT A PEDDLE FALL... and to "PUMP & HOLD" and "release" the peddle only on command... Your RESERVOIR person (probably you) should clean out cloudy brown fluid from the master cylinder and KEEP THE RESERVOIR half full at all times. The bleeder person (probably you) will also be bleeding at the wheels between constantly check that RESERVOIR.

Bleed the longest runs first... Use only fresh clean fluid and bleed until you see that fresh clean fluid come out of the bled brake.

Longest run on the back... alternate to the longest run on the front (these are really two separate systems). Be gentle and keep your bleeders safe & clean (they are actually quite delicate). Open only a little at a time... and snug them completely shut befor calling "RELEASE".

You likely will need to check & reset your ABS brake controller... If your troubles persist...

Vacuum bleeders suck... in EVERY sense of the word.

Hope this helps!

Go to Bing homepage

http://www.jcwhitney.com/performance-tool-offset-brake-bleeder-wrenches/p2017870.jcwx?filterid=c21432u0j1

Posted on Dec 03, 2016

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  • Nissan Master
  • 5,362 Answers

I think there only be one, but I've never heard of that valve actually causing your condition.
Did you get fluid from the bleeders at all wheels? Sometimes ABS systems interfere with brake bleeding. In that case, you need to follow Nissan's accepted practice. You would have to ask a Nissan mechanic or consult a repair manual.
If they all bled good, and still no brakes, I would be thinking it is the master cylinder gone bad. The interior seals on masters can wear, then leak internally. Won't leak to outside, but the master cannot force pressure in the brake lines, if the seals are bad.

Posted on Dec 03, 2016

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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

Proportioning valve stuck


rearline may be blocked

Oct 10, 2013 | Dodge Cars & Trucks

1 Answer

Front brakes


if the proportioning clogs or damaged it can cause brake problems such as yours take pressure readings on all 4 calipers the proportioning valve is just as it says differentiates the pressure front to back also the abs unit itself can cause the same problem also

Jun 25, 2013 | 2000 GMC Envoy

2 Answers

Changed brake pads and used a c-clamp to retract the piston in the caliper, never bled the brakes and my wife was driving the van 2 weeks later, applied the brakes and the peddle went right to the floor,...


Bleed the brakes, but it will probably still feel spongy. When you compress the Caliper you need to open the bleeder valve to release the pressure. It sounds like you busted the diaphragm in the proportioning valve. It is a costly mistake but one made alot now that more and more vehicles have anti-locking breaks. If bleeding and replacing the fluid do not help at all then I bet on the proportioning valve.

Apr 24, 2011 | Chevrolet Uplander LS Cars & Trucks

1 Answer

Installed new master cly.,bench bled, bled rr, broke off lr bleed valve (not opened), bled rf, tried bleeding lf but getting no fluid to caliper. is problem with proportiner valve?


The problem is probably that you must do the lr before moving to the front. The air in the lr will make it too spongy to bleed the front.
A wheel cylinder is only $25, so you might as well just replace it. And if you use vasoline or brake lube on the bleeder, it will not rust up on you next time.

Proportioning valves are not supposed to block a bleed. They can malfunction, but should not supposed to. And if you have the back working, that should reset the proportioning valve anyway. You can't leave the back. It must be finished.

Jun 07, 2010 | 1990 Plymouth Voyager

2 Answers

I have very little rear brakes on my 91 w350. the shoes are fine and so are the wheel cylinders. I have recently replaced the master cylinder and had the system power bled at a shop. Is it the...


I assume you bled the rest of the system. If so check your rear adjustment. Adjust the parking brake at the same time. If no fix, then open up your rear brakes and inspect the hardware, cylinder/caliper, and adjuster. Only after all that would I suspect the proportioning valve. Ways to test that vary vehicle to vehicle. Good luck!

Apr 20, 2010 | Dodge W250 Cars & Trucks

1 Answer

1993 jeep cherokee


It also sounds like a more likely problem is a seized caliper on the left side. If a caliper seizes, the braking system transfers the pedal pressure to the other caliper thus, the working caliper locks up. Pull both front wheels and look carefully at the wear on the pads. Both wheels should have the same amount of wear. If one side is worn more than the other, the side with the least wear is seized and needs to be changed.
Never heard of a hydraulic repostioning valve, but maybe with ABS there is one. I do know of a proportioning valve which apportions brake pressure front to back and also blocks braking to front or back in the event of brake line failure. Maybe see which he is talking about, should be able to explain the difference. Hope this helps.

Sep 11, 2009 | 1993 Jeep Cherokee Country

1 Answer

Rear brakes uneven breaking as per mot tester


The Chardes have a diagonal split system, so one of the front discs is plumbed to the diagonally located rear drum.

You may need to check the front brakes too and that they have been bleed properly.

Other common cause of uneven braking are:

seized wheel cylinder;
brake hose obstruction or weakend wall;
weak pull off spring on shoe;
uneven drum roundness;
compensator/proportioning valve dicky.

Oct 07, 2008 | 1991 Daihatsu Charade

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