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Replaced master cylinder abs and brake lights came on which before weren't on. Why or what caused this

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Check to see if the low brake fluid sensor in the resivoir is plugged in. If so check to see if the float in side is stuck

Posted on Nov 07, 2014

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Posted on Jan 02, 2017

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SOURCE: brakes

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

Posted on Mar 03, 2009

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SOURCE: 1994 Cavalier -replaced master cylinder-no pressure to rear brake

The most common bleeding procedure is to bleed the ABS brake furthest from the master cylinder first, then bleed the other brake that shares the same hydraulic circuit (which may be the other rear brake on a rear-wheel drive car, or the opposite front brake on a front-wheel drive car or minivan). After these have been bled, you then bleed the other brake circuit starting with the furthest brake from the master cylinder.
Air can be very difficult to remove from an ABS modulator assembly because of all the nooks and crannies inside the unit. The modulator may have eight to 10, or more, ABS/traction control solenoid valves, plus various check valves and dead-end ports. Some ABS modulators have special bleed screws to help you vent the trapped air when bleeding the system. Others do not and require the use of a scan tool to cycle the ABS solenoids while you bleed the system. 1. To bleed the isolation valves in the modulator, there are two bleeder screws. Start with the one toward the engine. Turn the ignition on and apply light pressure on the brake pedal. Open the bleeder screw and allow the fluid to flow until clear. Close the screw and do the same at the second bleeder screw. 2. Depressurize the accumulator by pumping the pedal 40 times with the key off. Wait about two minutes for the brake fluid to de-aerate, then refill the fluid reservoir with DOT 3 brake fluid. 3. Now you can bleed the boost section. This is done by applying moderate pressure on the brake pedal and turning the ignition on for three seconds, then off. Repeat this a total of 10 times. Make sure the pedal feels firm when you have finished, and give the car a road test to make sure the brakes are working properly.

Posted on Jul 25, 2009

  • 225 Answers

SOURCE: brake bleeding

if you didn't bleed the lines after putting the master in. then there is a good chance there is air in the lines now. may go through a quart of brake fluid before all the air is out. remember to start at r-rear/ l-rear/ r-front/ l-front last.will take some time. don't forget to adjust the rear brake while your there to help with the pedal

Posted on Aug 13, 2009

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SOURCE: abs light on in land rover

I have spent way too much money trying to get the 3 amigos to go out...ABS light, TC light and downhill descent. I have decided to try and ID the wires that go to those particular dash lights and cut them. I am tired of this ****. Landrover told me three different things that may cause this issue and told me to start with the least expensive one first! Go to hell, Landrover. I will NEVER buy another Landrover product. Which wires can I cut?

Posted on Oct 20, 2009

  • 510 Answers

SOURCE: the ABS light stays lit on my 2000 Subaru

ABS is anti lock braking system,which helps to stop car in various conditions.Wet/slippery etc
Sensors are located on all brakes
You need to go to your local auto electrician who will plug in scanner to locate fault

Posted on Jul 19, 2010

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99 caravan 3.3 no abs brakes. I have replaced a bad master cylinder and all 4 rusted brake lines. The ABS brake warning light is not on. The van does not pull to one side.


Something is wrong with your statement
it is a 99 caravan 3.3 no abs , then you are on about abs light pump etc
the abs pump only works when the master cylinder is under pressure and that pressure is suddenly reduced by the sensor reading a locked wheel and a valve is opened to release line pressure to that wheel As soon as that wheel starts to turn, the valve closes
while the wheel is stopped and that valve is open , the abs pump kicks in to maintain line pressure otherwise the brake pedal would go to the floor
master cylinders work through a. abs unit and not because of it so if the master cylinder becomes faulty, the abs pump will not operate until a wheel stops turning as there is no line pressure to stop a wheel turning
the abs light may not be on because there is nothing to operate the system to put it on

Apr 30, 2016 | Cars & Trucks

1 Answer

WHY DOES MY ABS AND BRAKE LIGHTS STAY ON?


brake and abs light check brake fluid level. The round float in the master cylinder directly controls the 2 dash lights.
The light is NOT directly controlled by the master cylinder float. The light is controlled by the ABS Module, which location depends on your vehicle. There are a number of different reasons the lights come on. If it comes on but shuts back off within seconds, don't worry about it, that occasionally happens when it gets a bad signal ("nonlatching error"). In rear-wheel-drive (RWD) vehicles, it is common for the differential speed sensor in the rear differential to go bad. You can pick up a Haynes manual to find if you can do at-home diagnostics (Temporarily grounding out the diagnostic lead will cause the ABS light to flash out a pattern indicating the error)


Check the Brake Pressure switch ( also known as SPEED CONTROL DEACTIVATION SWITCH ) which is located below the Brake fluid master cylinder for leakage. The leakage can cause both lights to stay on and also cruise control control not working

Sep 22, 2014 | 1998 Dodge Ram 1500 4WD

1 Answer

Abs and brake lights are on and annoying bell sound


make sure ABS SNSORS ARE SET PROPERLY AGAINST TONE WHEEL, air gap is zero .for your brake light you need to reset brake pressure valve below master cylinder where all lines meet before going to abs modual ,an advanced scanner will determin what wheels are causing problem . good luck on it .
Woody

Aug 10, 2014 | 2005 Chevrolet Avalanche

1 Answer

ABS light on and brakes locking up after master cylinder and brake booster replaced,what is wrong?


have it pumped down again an look at the fluids for contamination , inspect for leaks

Jul 25, 2014 | Hyundai Sonata Cars & Trucks

1 Answer

Abs brake system


Best case scenario bad vacuum pressure to the brake booster. Worst case bad abs control module or valve body/motor the abs system works by add and removing hydraulic pressure through valves and electric motor. Try using block off plugs at the master cylinder( remove lines plug outlets at master cylinder) check if brake pedal position and pressure is good(if there is no change problem is master cylinder or brake booster/ vacuum) if plugging at master cylinder solved issue repeat procedure at abs valve body after reinstalling lines from master cylinder if your problem returns your issue is in the abs valve body if plugging at the abs solves problem reconnect at the valve body bleed each line one by one testing between each line until you find the problem

Apr 11, 2014 | Hyundai Cars & Trucks

1 Answer

Ford Explorer Master Cylinder replacement


you need to bleed the brakes as well

Jul 10, 2013 | 1996 Ford Explorer

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

1 Answer

1999 corolla, brake pedal goes to the floor. how can we fix the brakes?


is the abs light on?the abs system only effects the pedal when you are stopping quickly to activate the system. you still have a hydrualic brake pressure problem. are the rear brakes shoes or pads? rear shoes out of adjustment can cause a low brake pedal.even though the master cylinder has been replaced doesn't mean you got a good part.if the part was a remanufactered part very likely it is bad. to determine if it is the master cylinder, plug off the lines from the side off the master cylinder and hit the brake pedal. if the pedal stays up look for a problem elsewhere in the system. if the pedal drops the the master cylinder is defective.

Jun 11, 2012 | Toyota Corolla Cars & Trucks

1 Answer

1993 F350 ABS light


i had a problem with my abs light one night i had a brake line behind the driver front tire broke and it was leaking out all of the fluid and the abs light came on i replaced the line and filled up the master cylinder and it went away so check your lines and master cylinder

Aug 18, 2008 | 1993 Ford F350

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