Question about 1990 Ford F150

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Rpm increases when brake is applied

Problem is. Intermittent and brakes are hard to stop truck

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  • Ford Master
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Your power brake booster has a leak. With the pedal depressed sometimes you can hear the leak coming out of apply shaft area under dash.

Posted on Apr 20, 2014

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Posted on Jan 02, 2017

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SOURCE: 96 F350 Hard Brake Pedal

My '96 f350 7.3 did the same thing. It was working fine I drove to the store then came out and the brake was hard. Then it was fine then hard again......turned out to be my vacuum pump. $100 fix now it brakes fine.
Hope this helps!

Posted on Aug 24, 2008

keeperoffire
  • 106 Answers

SOURCE: 1997 ford f150 lariat - won't shift out of park

It sounds like the shifter lock out solenoid has gone bad.It is a solenoid that releases the shifter when you push the brake pedal.

Posted on Mar 06, 2009

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SOURCE: Brake pedal goes down to floor. Putting brake fluid doesn't solve problem. Vehicle must coast to a complete stop.

First look for obvious leaks under the vehicle, especially the inside area of each wheel... If you see fluid, you have either a blown cylinder seal or a bad line (check the rubber hoses to the front and back brakes too) Repair the offending part and bleed the air out of the system... (remember to clean pads or shoes if they have fluid on them)... If you see no hint of leakage anywhere, then suspect the master cylinder... if you remove the master cylinder, check and make sure that it didn't leak fluid into the brake booster diaphragm (Brake fluid will destroy the booster)... as in any repair when you open the system (lose fluid), you will need to bleed out the air to restore function... hope this helps...;-)

Posted on May 04, 2009

  • 1 Answer

SOURCE: jumps forward when brakes are applied at intersections when stopping Doesn't happen all the time.

I don't know if this would be considered a solution or not but in 2006 Ford implemented a new transmission (6 speed automatic) and they have and still have a lot of problems. It is fixed (helped may be more appropriate) by a computer upgrade done by the dealership. MY wife has had nothing but problems out of her 2006 limited ford explorer. The whole computer system had to be replaced at 32,000 miles and then they charged us to upgrade the new computer they put into the car. It's almost comical at this point. The transmission problem has been solved for the most part on our vehichle but it took several ford computer updates. I hope this helps!

Posted on May 29, 2009

  • 33 Answers

SOURCE: engine revs remain high or increase when braking

Have you tried checking your throttle positioning sensor. Possible vacuum leak or check for carbon build up in the throttle body not letting the throttle valve shut all the way.

Posted on Jul 24, 2009

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1 Answer

I just bought a 2010 buick enclave cxl and on slight incline in drive will roll back. ? Its like the rpms arent where they should be. I don't think the weight should pull it back so much. Thanks


The parking brake is the way to stop it rolling back. Idle RPM are set and have no bearing on how the car rolls back. apart from if you increase the revs, the car will move. The proper procedure on an incline is to apply the parking brake, put the vehicle into drive, increase the revs and take off the parking brake. Just like we did in the old days when we had manual gearboxes :>)

May 24, 2016 | Buick Cars & Trucks

1 Answer

Where's is the fuse located for my brake lights on my 2007 Pontiac g6 and rear defrost fuse


Stop Lamps
your br
The brake pedal position sensor is used to sense the action of the driver application of the brake pedal. The brake pedal position sensor provides an analog voltage signal that will increase as the brake pedal is applied. The body control module (BCM) provides a low reference signal and a 5-volt reference voltage to the brake pedal position sensor. When the variable signal reaches a voltage threshold indicating the brakes have been applied, the BCM will apply battery positive voltage to the stop lamps, transmission control module (TCM), engine control module (ECM), and stop lamp relay coil side. When the stop lamp relay receives battery voltage from the BCM, the relay coil is energized and the stop lamp relay switch contacts close applying battery voltage through the STOP LP fuse to illuminate the center high mounted stop lamp (CHMSL).
I'd say you have more then a bad fuse ,just reading how the brake lights function .You should have it hooked up to a professional grade scan tool ,one that can check for DTC'S - diagnostic trouble codes in the BCM - body control module !
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, observe the Brake Pedal Position Sensor parameter in the data list for the body control module (BCM).
  4. Apply and release the brake pedal.
Does the scan tool display a change in the voltage?

DTC B3903 Stop Lamp Relay Circuit DTC C0277 Brake Pedal Position Sensor Circuit
DTC C0278
Did you perform the Diagnostic System Check - Vehicle?
Go to Step 2
Go to Diagnostic System Check - Vehicle

2

  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
Does the scan tool display DTC C0278 00?
Go to Step 3
Go to Testing for Intermittent Conditions and Poor Connections

3

Recalibrate the brake position sensor.

Circuit Description
DTC C0870
The body control module (BCM) applies a ground through the brake sensor reference low circuit to the brake pedal position (BPP) sensor. The BCM supplies a 5-volt reference through the brake sensor reference voltage circuit to the brake position sensor. When the brake pedal is being applied, the BPP sensor then sends a variable voltage signal through the brake sensor signal circuit to the BCM.
Circuit/System Verification
  1. Ignition ON, observe the scan tool Brake Lamp Cmd. parameter as you apply and unapply the brake pedal. The parameter should change between OFF and ON as the brake pedal is applied and released.
  2. ?‡'
    If the parameter does not change as the brake pedal is applied and released, refer to Brake Pedal Position Sensor (BPPS) Malfunction.

  3. With a scan tool, command the LR Stop/Turn Signal Lamp ON and OFF. The LR turn signal should turn ON and OFF when changing between the commanded states.
  4. ?‡'
    If the LR stop lamp does not illuminate when commanded, refer to Stop Lamps Malfunction.

  5. With a scan tool, command the RR Stop/Turn Signal Lamp ON and OFF. The RR turn signal should turn ON and OFF when changing between the commanded states.
?‡'
If the RR stop lamp does not illuminate when commanded, refer to Stop Lamps Malfunction.






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Sep 26, 2015 | Pontiac Cars & Trucks

1 Answer

My car run good but idle problems n stop running on because rpm go to low when engage ,on stop or red light but reward wright away what should I check? Thx


test the brake booster by idling the engine with out the foot brake applied then apply the brake
if the fault appears with the brake applied ,replace the brake booster.

Aug 30, 2015 | Jaguar XJ6 Cars & Trucks

1 Answer

ABS engages without braking


Check all wheel sensors for broken wires, loose connectors or position of sensors in their mounting brackets.

Mar 29, 2017 | Cars & Trucks

1 Answer

Run away 2001 Grand Am


Brake switch is designed to shut cruise off when brake pedal applied, sounds like a defective brake switch, because when she applied the brakes it's supposed to cut power to cruise module, so either that is problem or your throttle cable had iced up and or both

Jan 22, 2013 | 2001 Pontiac Grand Am

1 Answer

On my 2004 Jetta 1,8T the brakes are starting to get hard. Taking s little more pressure on the brake pedal to stop the car. What could be causing this??? Thanks


The most likely cause is loss of power assistance to the braking system which means you will need to apply increased brake pressure to compensate for the loss of assistance.

The problem will be with the brake servo assist. It is possible there is a leak in the brake servo assist system, which reduces the vacuum, so you are not getting sufficient mechanical assistance when applying the brakes.

It is unwise to be driving the car with this condition. If you lose all power assistance to the brakes, which could easily occur with this fault, the pedal will become very hard, you will need to apply very high pedal pressure and the vehicle will be very difficult to stop. You need to take the car to a VW dealer for service or to a competent brake specialist in your area to inspect the system and rectify the fault.

VW did a recall on some earlier year models for a leaking brake servo and I understand the problem was a faulty vacuum hose which would fail and leak. I am not aware of any recall for this item on later models like your 2004 vehicle.

All the best.

Dec 03, 2010 | 1997 Volkswagen Jetta

2 Answers

Engine increases rpm when brake pedal is depressed


Inspect brake booster vacuum line from engine intake to brake booster for leaks also inspect brake booster check valve, more than likely your brake booster is causing a vacuum leak to your Intake thus leaning mixture wich increases idle rpm

Apr 03, 2010 | 1990 Toyota Pickup

1 Answer

Drum brakes causing intermittent grinding noise


Sounds like one of the springs that hold the rear brakes in place broke. Jack her up, pop off the tire, remove the drum and take a look. If you need to see what a good one looks like, look on the other side.

This is not a very common problem, but I saw it last year on a 69 chevelle.

Good Luck and thanks for using FixYa!!

Mar 26, 2010 | 1966 Ford Mustang

1 Answer

2002 vw passat....starts fine and drives fine....periodically stalls when braking for stop..this happens after a few miles of driving and is hard to get going again but will start and if reved up a bit I...


It appears that your brake booster system has a major vacuum leak which is causing the engine to go lean and stall. Check the hose between the intake manifold and the brake booster. It may be cracked or loose causing outside air to enter the hose when the brake is applied.

Jan 08, 2010 | Volkswagen Passat Cars & Trucks

1 Answer

Very high idle


probably is brake booster if you can hear hissing sound, would not advise disconnecting hose, would be extremely hard to stop the vehicle, a dangerous situation. also check for vaccum leaks on intake manifold. follow brake booster hose to engine and check for leak from there

Nov 28, 2008 | 1994 Chevrolet S-10 Blazer

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