Question about 1988 Ford F 350

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No brake pressure on brake pedal truck not stopping

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  • Ford Master
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If you don't have any leaks , then your master cylinder is toast, and will have to be replaced. Look under the truck at the inside of the wheels. If one or more of them is wet with brake fluid, it's probably a wheel cylinder leaking. If it's all dry, and no leaks anywhere else, and your master cylinder is full, then you need a master cylinder.

Posted on Aug 30, 2010

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Why do i have loss of brake pressure


Long shot: Bad master cylinder - Typically the brake pedal will slowly sink to the floor. On early 2000 vintage Chrysler products you need to check brake lines as they have been known to rust (and fail catastrophically)

Jul 04, 2014 | 2003 Jeep Wrangler

2 Answers

How do you know that a brake booster is bad?


Booster problems are rare but they do go bad sometimes.
A bad booster generally causes the brake pedal to feel hard to push down, and a lot of pressure on the brake pedal is required to make the car stop.
Rarely, a vacuum brake booster will develop a vacuum leak, which can cause engine performance problems, hissing or whistling noise, as well as requiring increased pressure on the brake pedal to stop.

The first test:
With the vehicle parked, turned OFF, and the parking brake set, pump the brake pedal 5 to 6 times. If the pedal gets harder to push after several times, your booster is probably good.

The second test (To make sure):
After the test above, without making any changes, press and hold the brake pedal with light to moderate pressure.
Now with your foot still on the brake pedal, start the vehicle.
If the booster is good, you will feel the pedal go down when the engine starts.

Hope this helps!

Jun 21, 2014 | 1993 Cadillac DeVille

1 Answer

Brake lights wont work when pressure is applied


brake switch needs adjustment if it works with slight pressure on the pedal readjust it where it needs to be..

Feb 09, 2013 | 1999 GMC Yukon

1 Answer

Vw golf 2000 the brake pedal is to soft when you apply it and seems like is not going to stop but it does, what is the problem?


Not sure if you have done all this.



BRAKE BOOSTER INSPECTION

Functional test:
1. With the engine stopped, Depress the brake pedal several times, then depress the pedal hard and hold that pressure for 15 seconds. If the pedal sinks, the master cylinder, brake line or a brake caliper is faulty
2. Start the engine with the pedal depressed. If the pedal sinks slightly, the vacuum booster is working. If the pedal height does not vary, the booster or the check valve is faulty

Leak Test:
1. Depress the brake pedal with the engine running then stop the engine. If the pedal height does not vary while depressed for 30 seconds, the vacuum booster is OK. If the pedal rises, the booster is faulty
2. With the engine stopped, depress the brake pedal several times using normal pressure. When the pedal is first depressed, it should be low. On consecutive applications, the pedal height should gradually rise. If the pedal position does not vary, check the booster check valve.

Check valve test:
1. Disconnect the brake booster vacuum hose at the booster.
2. Start the engine and let it idle. There should be a vacuum available. If no vacuum is available, the check valve is not working correctly. Replace the check valve and retest.

END TEST

Nov 06, 2012 | Volkswagen Cars & Trucks

1 Answer

When coming to a stop, the brakes work fine until I get almost stopped, then the pedal will push down further and brakes will come on hard, and stop vehicle hard, what could be the problem?


Sounds like your master cylinder is bad on your brake system. If you are stopped in your driveway(not on the street) leave the vehicle in park. Start the car and place your foot on the brake with light pressure and keep this pressure on the pedal. If the pedal continues to drop slowly to the floorboard your master cylinder is leaking past the primary piston in the master cylinder. If this is the case have this repaired immediately. Your brakes could just all of a sudden not be there the next time you apply them when you need to stop.

Apr 05, 2012 | 1995 Buick LeSabre

1 Answer

My passat has no brakes, changed pads still no help how do i figure out weather its the master cylinder or the brake booster?


to check the booster
put some pressure on brake pedal with engine stopped
keeping the pressure on pedal start engine pedal should move down if booster is working

Feb 14, 2011 | 1999 Volkswagen Passat

1 Answer

Brake pedal falls after stopping on 1995 suzuki sidekcik. replaced master cylinder and two rear wheel cylinders and bled system but issue still there. Brakes work fine but after you come to a complete...


I think u got problem on ur rear brake regulator, check that regulator that is located between the two rear brake lines.

The purpose of that barke pressure/limiter regulator is to control the hydraulic pressure on both rear brakes, bleed that and check if the and clean it.....

Dec 02, 2010 | 1995 Suzuki Sidekick

1 Answer

2000 Chrysler Grand Caravan, replaced the front driver brake caliper, the brake lines from the master cylinder to the ABS and the rubber hose from the caliper to the brake line, bled all the brakes but the...


i suggest a bad master cylinder, but 1st answer this, when you apply brakes firmly and keep pressure on the brake pedal, does pedal go down while you're holding pressure on the pedal? if so, the master cylinders bad. and also have you checked the vacum to the brake booster?

Aug 24, 2010 | 2000 Chrysler Grand Voyager

1 Answer

Brake lights


Brake lights are controlled by one of two means; a switch, normally located under the dashboard which is operated by the brake pedal suspension or a pressure sensitive switch that monitors the hydraulic fluid pressure of the braking system.
The first switch makes contact when the pedal is pushed, the second, when pressure rises in the braking system. .

Either way, the switch has probably failed or is the first type, the pedal is not returning all the way to its stop therefore leaving the mechanical switch in its 'on' mode.

Check for the mechanical switch first under the dash and press the brake pedal just with your hand while you are watching the suspension to see if when you let go of the pedal that it returns to its stop.
Once you let go of it, lift it to see if there is still a distance to the pedal stop.

I have seen this kind of switch get worn or sticky and prevent the pedal suspension from returning completely which will keep the brake lights on.

If you find no mechanical switch under the dash, locating a pressure switch is more difficult since it is likely under the hood and perhaps not easily seen.
You might need a Peugeot mechanic to locate it for you.

Jul 03, 2008 | 2005 Peugeot 405

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