Question about 1989 Chevrolet C/K 3500

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Brake warning light stays on. Reset piston on porportioning valve a few times, but comes back on after pressing brakes hard. No rear brakes when light is on. Changed prop. valve once but didn't help problem.

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Try replacing the master cylinder with a new resivoir and flushing your brake lines.

Posted on May 30, 2010

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  • Chevrolet Master
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Te brake warning ligt will come on for one of tree reasons # te emergency brake is on or connection for E-brake3 is grounded.#you are low on brake fluid indicating a leak.#3 you ave a bad speed senspor or bearing throwing a code for the abs system wic will also turn a brake ligt on if te fuse blew.

Posted on May 30, 2010

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What makes the rear brakes locks up when the brakes are applied?


Sounds like the problem is with the front brakes not working right unless someone messed with the rears.

Apr 16, 2015 | Cars & Trucks

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Have a 99 Toyota camry n brake light is on after changing right front brake caliper


Master cylinder fluid piston has entered into a brake safe mode.
when the high pressure brake system is opened in any way, the brake master cylinder piston reaches to the far end of the master cylinder which trips the brake system warning light.

This brake light condition is due to sudden loss of brake fluid pressure on the right front brake caliper assembly during the replacement.

Left rear brake caliper bleed valve will ned to be "opened" until master cylinder piston travels into the opposite direction which "resets" the brake system warning light.

Dot 4 brake fluid recommened for most, but not all vehicles.
Reference vehicle to owners manual for replacement fluid is replaced under master cylinder brake system cap.

Aug 18, 2013 | 1993 Buick Park Avenue

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1990 Reatta. Replaced all calipers and hoses. Cannot get fluid to rear brakes. Porportioning valve is OK. No fluid coming to it. Is there a way to cycle the master cylinder valves to cycle fluid...


I would try replaceing the master clylender and rebleed the brakes start at the right rear have some one help you press the brake paddle down and hold it open bleeder its where the brake line connects to the brakes looks like a greese fitting open the bleeder then close it let brake paddle back up repeat until you have fluid comeing out of bleeder go to the left rear do the same then right front to left front

Aug 23, 2011 | 1990 Buick Reatta

1 Answer

The brake light is on on my 1987 Chevy Truck. Its from the proportioning valve, not the parking brake. Is their any thing to check, or just replace the valve?


The proportioning valve simply ensures that the front brakes are applied before the rear brakes are, to prevent sideways skids from loss of rear traction. The valve also serves as a warning light when one end, either front or rear, of the system has deficient line pressure. Inside the valve is a cylinder, and a piston that belongs in the center of the valve cylinder (when fluid pressure on each side is equal). When one side of the valve (front or rear brake system) loses pressure (like from a leaking brake line), the piston gets pushed to the low pressure end and makes contact with a switch terminal that turns the light on.The trick to turning the light off is to figure out which end, front or rear brakes, the piston is on, and then bleed the other end to center the piston and turn the light off. Too much pressure on the brake pedal will cause the piston to go past center to the opposite end, and a close watch on the brake warning light will reveal that as the lamp will flicker once while the piston passes center.
Gently depress the brake pedal (requires an assistant) with a bleeder open and close the bleeder as soon as the assistant (brake pumper) sees the light go out. If he sees the light flicker once bleed the other end of the vehicle to go back towards center.

Jul 21, 2011 | 1987 Chevrolet V10

1 Answer

I have a 1992 izuzu rodeo LS 4x4 v6 and my brakes are having a hard time stopping i have replased the master cylinder the brake pads the rotors iv bled them but it still has a hard time stopping and it...


Check the caliper sliders, they may be seized causing limited brake pad contact. Also check the calipers for siezed pistons.
After bleeding the system, sometimes the proportioning valve will have to be reset manually. You can do this by having an assistant press the brake pedal and open a bleeder screw slightly on one side [ front or rear ] of the system, it may reset. If not, try doing the other side of the system.
If the brake pedal seems to be pushing back against you then either the Brake Booster isn't getting proper vacumn, or is faulty.
If the vehicle has drum rear brakes, make sure they are adjusted properly. If they are set too loose the pedal will feel spongy and low.
Hope this helps.

May 01, 2011 | 1992 Isuzu Rodeo

1 Answer

No brake fluid to the rear wheel cylinders


You'll need to start bleeding the brake system at the Master cylinder to determine where the problem lies.

The lines coming out of the master cylinder will need to be loosened & bled there, initially you can just do the back ones to identify the problem, but once fixed, the system will have to be bled from the Master cylinder first, then the farthest wheel from it, then next farthest, then next, until you do the drivers wheel last.

This method of bleeding the brakes prevents air from crossing from one line to another, causing air to be left in the system.

Back to bleeding the rear brakes first: As someone pumps up the brake pressure, making sure the resivoir stays full, with the cap on between bleeding, and have the person pressing the pedal to do these thngs.
1. Always move the pedal slowly, pressing and releasing.
2. Never release the pressure on the pedal after bleeding a brake, until the line is tightened, then release slowly to prevent air from getting into the fluid.

You should of course get fluid at the master cylinder when you bleed it (or just replace it), then you'll need to bleed the line at the right rear wheel (first) a few times to get fluid if it's been leaking, then the left rear wheel. If you get pressure but no fluid to the rear and the master cyliinder did have pressure released when you bled it, there is either a restriction in the line itself, or the porportioning valve could be damaged. (unusual for the valve to go bad actually, inspect lines for damage such as being pinched if you're getting pressure but no fluid.

Final test if it hasn't been resolved-remove lines at porportioning valve & make sure fluid is leaving/entering there as it should. If you find it defective, a good replacement can come from a salvage yard, or you can buy them new.

Brake fluid on the floorboard under the dash near the brake pedal=bad Master Cylinder.

good luck

Feb 21, 2010 | 1996 GMC Jimmy

4 Answers

My daughters 2005 4 door elantra has a brake warning light that won't go out.the car was examined and she was told that every thing with that system was working fine and he couldn't say why the warning...


The brake fliud resorvoir may have a sensor on it that is at fault. Also if the brake pads are getting very tin the light will stay on for the brake fluid is low if not filled. Fill the fluid up and see if the light goes off. The sensor if equipt will have two wires for a conection

Feb 04, 2010 | 2005 Hyundai Elantra

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Camry CE 2001: Changed the brake light in the


hi the rear high level brake warning light in rear screen ? works with the other two brake lights at same time when you press brake pedal with ignition on ? so may i suggest you check the other brake lights are working ? if not ? check these bulbs? reason being that from the symptoms you describe that high level light is staying on ? it would suggest that the brake light switch at the pedal is not operating ie not putting brake lights off when pedal is off and would suspect the brake lights have been on for some time and burned bulbs out due to the brakelight element in bulbs are high wattage if you check on what i have suggested? and is the case ? come back and will advise you how to adjust brake switch easy diy hope this helps? best wishes from the uk

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Dash break light staying on


un plug the module under the master cylinder and see if brake lamp goes out...if light goes out you may have a rear abs problem..hope this helps you!!

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Brakes


Flexible brake lines are probably balooning out causing pressure not to build up, replace flexible to the calipers.

Jul 26, 2008 | 1989 Chevrolet Silverado 2500

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