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Just what are the symptoms of a faulty master cylinder?

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Low brake pedal and or soft pedal or goes to floor at times but will pump back up.

Posted on Oct 13, 2008

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Run fines when cool but after engine heats brakes tighten and motor becomes to forcefull till it doesnt move anymore, after coll run fine back again till you know???


Your description isn't very comprehensive but I think what you are saying is your brakes are being applied progressively as you drive until they finally lock on altogether?



I have experienced this condition a number of times before and it was relatively common before the days of computers and robots.

I have known one occasion when a faulty vacuum servo gave similar symptoms and that usually very reliable component was made faulty by a leaking brake master cylinder that had over a long period, half filled the brake booster with fluid.

In all other cases the auto-application of the brakes as they are used is due to the fluid expanding as it warms due to use and is unable to escape back into the brake reservoir and so increasingly applies the brakes.

This can be verified easily as the brakes will be hot and momentarily slackening a couple of pipes from the master cylinder or a couple of bleed nipples will immediately free the brakes.



Although there are a few theoretical possible causes for this it is usually (and exclusively in my personal experience) due to bad maintenance or repair in the vehicle's recent history.



Replacement of the brake booster and/or the brake master cylinder without ensuring all the correct clearance and adjustment checks are made is the prime culprit. The second favourite is the person who adjusts the brake pedal linkage to obtain a firmer pedal feel with less free travel.



There is one more thing I can think of that can provide similar symptoms but that applies exclusively to drum brakes and is where the bonding of the lining material is failing causing the brake to self-apply.

Feb 20, 2015 | 2002 Ford Escape

1 Answer

Break line broke replaced no leaks can't get break paddle99 Chevy


Sounds like you may have an air bubble in the master cylinder. The most effective way to deal with that is getting a master cylinder bleeder kit from your local parts store - make sure it has the metal clips that will hold the hoses in the master cylinder. Install line adapters after removing brake lines from the master. top up the fluid in the master and install hose clips, making sure the end of the hoses are in the brake fluid at least 1 inch. Slowly pump the brake pedal, making sure you bottom out the pedal and release SLOWLY so you don\'t suck air into the hoses - have a helper watch the fluid level in the master cylinder and the bubble production. The fluid level should not sink during this procedure - if it does, then you may have a faulty master cylinder. Pump until you have no more bubbles. If the bubbles don\'t stop, then you have a faulty master cylinder.

Hope this helps!!

Dec 01, 2013 | 1995 Chevrolet K1500

1 Answer

1997 Jarguar. Code P0303. Missfire


Code info from:
http://www.obd-codes.com/p0303

Cylinder #3 Misfire Detected
What does that mean?

A P0303 code means that the the car's computer has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #3.
FB.init("dd7d9e9681341cde77587bc6a2029f6f"); OBD-Codes.com on Facebook Symptoms Symptoms may include:

  • the engine may be harder to start
  • the engine may stumble / stumble, and/or hesitate
  • other symptoms may also be present
Causes

A code P0303 may mean that one or more of the following has happened:

  • Faulty spark plug or wire
  • Faulty coil (pack)
  • Faulty oxygen sensor(s)
  • Faulty fuel injector
  • Burned exhaust valve
  • Faulty catalytic converter(s)
  • Running out of fuel
  • Poor compression
  • Defective computer
Possible Solutions

If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.

If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic convertermag-glass_10x10.gif has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

Apr 25, 2011 | Jaguar Vanden Plas Cars & Trucks

3 Answers

99 ford explorer brake pedal goes to floor. Booster or master cyl. ?


Not likely that the booster is an issue. The booster would not be able to overcome the brake fluid compression.
First open and inspect all brakes for leaks, adjustment, etc. Check all brake lines.
So if no leaks, did the fluid go low in the MC? If so, pad consumption would eat more than a MC reservoir of fluid, and not require MC replacement, but rebleeding and top up of fluid. If the pads are worn, and you replace them, often this will expel air back through the MC.

If you determine the MC is faulty, bench bleed the new one before install, or you will have lots of problems getting air out....

Mar 03, 2011 | 1999 Ford Explorer

2 Answers

Brake pedal goes to floor


From the symptom you have stated, there is a problem with brake system. You have not mentioned whether you have any braking effect on the vehicle when the brake pedal goes to floor. Anyway, you may check the following:
1. Check brake fluid level in the brake fluid reservoir. If the level is less, then you have to go to a garage as just filling up the fluid will not help and the brake hydraulic system needs bleeding.
2. Get the brake adjustment of all the wheels checked by an experienced garage mechanic.
3. Get the Brake Master and Wheel cylinders checked by an experienced garage mechanic.
4. The brake liners might be worn out. Get the same checked by an experienced garage mechanic.
5. Brake pipes which convey brake fluid from Master cylinder to the wheels might be leaking. Get the same checked by an experienced garage mechanic.
Whatever may be the cause of the symptom, do not use your vehicle till you get the problem solved as you are accedent prone without the brake system proper functioning.
Good luck..

Feb 20, 2011 | GMC Blazer Cars & Trucks

2 Answers

My volvo s70 break pedal goes all the way to the floor ad new master cilinder new bled nipals stil after 2week its gone back down again what do i do next


It sounds like you have a small brake fluid leak, allowing air to enter the system. Small leaks can be hard to find. You will have to remove the wheels in order to inspect the calipers. Also make sure the bleeder valves are tightened securely after bleeding the brakes. Did you bleed the master cylinder when you first installed it? If you can't find a leak, bleed the entire system again, including he master cylinder.

Feb 15, 2011 | Volvo S70 Cars & Trucks

1 Answer

2002 jeep liberty. Codes P0300,301, 302


P0300 - Random/Multiple Cylinder Misfire Detected
Basically this means that the the car's computer has detected that not all of the engine's cylinders are firing properly.

A P0300 diagnostic code indicates a random or multiple misfire. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0302 code, for example, would tell you cylinder number two is misfiring. Unfortunately, a P0300 doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why.

Symptoms may include:
* the engine may be harder to start
* the engine may stumble / stumble, and/or hesitate
* other symptoms may also be present

Causes: A code P0300 may mean that one or more of the following has happened:
* Faulty spark plugs or wires
* Faulty coil (pack)
* Faulty oxygen sensor(s)
* Faulty fuel injector(s)
* Burned exhaust valve
* Faulty catalytic converter(s)
* Stuck/blocked EGR valve / passages
* Faulty camshaft position sensor
* Defective computer

Possible Solutions
- If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.
- If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.


P0301 Code - Cylinder #1 Misfire
P0302 Code - Cylinder #2 Misfire

A P0301 or P0302 code means that the the car's computer has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #1 or #2

Symptoms may include:
* the engine may be harder to start
* the engine may stumble / stumble, and/or hesitate
* other symptoms may also be present

Causes: A code P0301 or P0302 may mean that one or more of the following has happened:
* Faulty spark plug or wire
* Faulty coil (pack)
* Faulty oxygen sensor(s)
* Faulty fuel injector
* Burned exhaust valve
* Faulty catalytic converter(s)
* Running out of fuel
* Poor compression
* Defective computer

Possible Solutions:
- If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.
- If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.


Hope ths helps. Keep us updated and remember to rate this answer.

Jan 03, 2011 | 2002 Jeep Liberty

1 Answer

Vehicle is a resto-mod 1970 Challenger. Original front drum brakes replaced with ECI disk conversion package. After driving a short distance front brakes begin to drag, eventually remaining almost fully...


BJ

I doubt the problem is the calipers as I would not expect them both to be faulty.

I do not think it is the proportioning valve.

From the symptoms you have described it sounds very much like the master cylinder is faulty. If the car is a resto mod with upgraded brakes I assume the original master cylinder has been replaced with some late model unit, either new or used.

I could not comment further without inspecting and testing the car. Some resto mods are carried out by amateur car enthusiast (as you know) rather than professionals and amateurs frequently undertake brake modifications that should be left to the experts.

I would be taking the car to a competent brake specialist to check it out. especially as the braking system has been modified with an aftermarket kit. This is not a DIY task and I would advise you not to try fiddling with the braking system in an attempt to fix this problem yourself.

Sean

Nov 30, 2010 | Dodge Challenger Cars & Trucks

2 Answers

How can i tell whether it is my master cylinder or my slave cylinder that is faulty on my 2003 1.9 dci renault megane


i think you mean the clutch master look under the dash where the clutch rod is se if it is wet on the fire wall in side the car then look at the slave se if it is wet

Feb 01, 2010 | Renault Le Car Cars & Trucks

2 Answers

1996 f150 5.0L misfire code


P0307 Code - Cylinder #7 Misfire Technical Description Cylinder #7 Misfire Detected
What does that mean? A P0307 code means that the the car's computer has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #7.
copyscape.gif SymptomsSymptoms may include:
  • the engine may be harder to start
  • the engine may stumble / stumble, and/or hesitate
  • other symptoms may also be present
Causes A code P0307 may mean that one or more of the following has happened:
  • Faulty spark plug or wire
  • Faulty coil (pack)
  • Faulty oxygen sensor(s)
  • Faulty fuel injector
  • Burned exhaust valve
  • Faulty catalytic converter(s)
  • Running out of fuel
  • Poor compression
  • Defective computer
Possible Solutions If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.
If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty

Jan 14, 2009 | 1996 Ford F150 Regular Cab

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