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No pressure on the brakes - 1997 Volkswagen Jetta

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Check your Power Booster which is against the drivers side firewall next to your Master Cylinder.

Posted on Jun 03, 2010

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Posted on Jan 02, 2017

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Problem code c1440on 2003 ford explorer


C1440 Pressure Transducer Input Circuit Failure YES
C1440 (ABS only) Pressure Transducer Input Circuit Failure ABS Module Go To Pinpoint Test P .
Normal Operation The brake pressure switch provides an additional speed control deactivation if the brake pedal position (BPP) switch fails. When the brake pedal is pressed, 1700 kPa (246 psi) of brake fluid pressure in the brake master cylinder opens the brake pressure switch, removing B+ voltage to the speed control servo electric clutch.
    Possible Causes
  • circuit 10 (LG) open
  • circuit 307 (BK/YE) open, short to power
  • ABS module
  • brake pressure switch
  • speed control deactivator switch
PINPOINT TEST P: DTC C1440 (ABS ONLY) - PRESSURE TRANSDUCER SIGNAL FAULT CAUTION: Use the flex probe kit for all test connections to prevent damage to the wiring terminals. Do not use standard multimeter probes.
Test Step Result / Action to Take P1 VERIFY THE DTC
  • Connect the diagnostic tool.
  • Key in ON position.
  • Clear DTC C1440. Road test the vehicle. Repeat the self-test.
  • Does DTC C1440 repeat?
Yes
GO to P2 .

No
The system is OK at this time. P2 MONITOR THE BRAKE PRESSURE SWITCH PID FOR CLOSED POSITION
  • Enter the following diagnostic mode on the diagnostic tool: ABS Module PID.
  • Monitor the powertrain control module (PCM) brake pressure switch PID.
  • With foot off the brake pedal, does the PID read closed?
Yes
GO to P3 .

No
GO to P4 . P3 MONITOR THE BRAKE PRESSURE SWITCH PID FOR OPEN POSITION
  • Enter the following diagnostic mode on the diagnostic tool: ABS Module PID.
  • Monitor the PCM brake pressure switch PID.
  • While pressing the brake pedal, does the PID read open?
Yes
GO to P9

No
GO to P7 . P4 CHECK THE CIRCUIT 10 (LG/RD) FOR AN OPEN
  • Key in OFF position.
  • Disconnect: Speed Control Deactivator Switch C1025.
  • Key in ON position.
  • Measure the voltage between the brake pressure switch C1025-2, circuit 10 (LG/RD), harness side and ground.
  • Is the voltage greater than 10 volts?
Yes
GO to P5 .

No
REPAIR the circuit. CLEAR the DTCs and REPEAT the self-test. P5 CHECK THE BRAKE PRESSURE SWITCH
  • Key in OFF position.
  • Measure the resistance across the brake pressure switch pins, component side.
  • Is the resistance less than 5 ohms?
Yes
GO to P6 .

No
INSTALL a new speed control deactivator switch. REFER to Section 310-03 . CLEAR the DTCs. REPEAT the self-test. P6 CHECK CIRCUIT 307 (BK/YE) FOR AN OPEN
  • Connect: Speed Control Deactivator Switch C1025.
  • Disconnect: ABS Module C155.
  • Measure the voltage between the ABS module C155-40, circuit 307 (BK/YE). harness side and ground.
  • Is the voltage greater than 10 volts?
Yes
GO to P9

No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. P7 CHECK CIRCUIT 307 (BK/YE) FOR A SHORT TO POWER
  • Key in OFF position.
  • Disconnect: Brake Pressure Switch C1025.
  • Key in ON position.
  • Measure the voltage between the ABS module C155-40, circuit 307 (BK/YE), harness side and ground.
  • Is any voltage present?
Yes
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

No
GO to P8 . P8 CHECK BRAKE PRESSURE SWITCH
  • Start the engine.
  • Measure the resistance between the brake pressure switch C1025 pin 1, component side and the brake pressure switch C1025 pin 2, component side while firmly pressing the brake pedal.
  • Is the resistance greater than 10,000 ohms?
Yes
GO to P9 .

No
INSTALL a new speed control deactivator switch. REFER to Section 310-03 . CLEAR the DTCs. REPEAT the self-test. P9 CHECK FOR CORRECT ABS MODULE OPERATION
  • Disconnect all ABS connectors.
  • Check for:
    • corrosion
    • pushed-out pins
  • Connect all ABS connectors and make sure they seat correctly.
  • Operate the system and verify the concern is still present.
  • Is the concern still present?
Yes
INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module in this section. TEST the system for normal operation.

No
The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.

Jul 01, 2017 | Ford Cars & Trucks

1 Answer

On a 2007 Kenworth T800 what causes the brake lights to come on , the cruise to shut off, and application pressure to stay up


the brake lights will come on when the brake light switch senses air pressure in the switch
That will disconnect the cruise control as it reads that you have put the brakes on
The application pressure I take it is the pressure in the brake lines when the brake pedal is depressed
I would be looking at a leaking valve in the foot brake treadle valve

Oct 16, 2015 | Cars & Trucks

1 Answer

Replacing brake pressure switch Chrysler pacifica


Duralast/Brake Pressure Warning Switch PS184 ... - AutoZone

www.autozone.com/brakes.../brake-pressure...switch/...brake-p...
AutoZoneShop for Duralast/Brake Pressure Warning Switch PS184 with confidence atAutoZone.com. Parts are just part of what we do.

Sep 24, 2015 | 2008 Chrysler Pacifica

1 Answer

Why do I have good brake pressure when turned off but no pressure with car started?


With the engine running there is piece of assistive technology called a 'brake servo'. This amplifies what you do to the brake pedal and amplifies it to the four brake calipers and the hydraulic pistons inside them. When the engine is off, you are operating the brakes manually which is why you feel all that pressure.

You brake lines have either got air in them and need bleeding, or your brake servo is faulty.

This is a bit of an infomercial but explains.
http://youtu.be/L0oUejw5Edc

This is the traditional two-person way
http://www.popularmechanics.com/cars/how-to/a1495/how-to-bleed-brakes/


How Power Brakes Work HowStuffWorks

Sep 21, 2015 | 2001 Chevrolet Impala

1 Answer

My brake peddle when car is off holds pressure turn car to the on pressure goes away is this sound like brake booster


yes that is the brake booster that is active to control the amount of pressure applied to the brakes. when the car is off and you press your brakes it has pressure to prevent the booster from being used when car is off.

Jan 27, 2015 | Cars & Trucks

1 Answer

I have a 91 explorer and have lost brake pressure, at first it was requiring a lot of brake fluid and that would fix it for a day or 2 then no brake pressure again so I replaced the master cylinder and it...


may I know if you feel very hard to push the brake pedal? if so , there must be the problem of power brake booster. it is leaked and lack of pressure. or you have bad and weared brake pads.
feel free to ask more questions.

www.fiverhope.com

Sep 10, 2013 | Cars & Trucks

1 Answer

1937 ford coupe relpaced booster brake pressure when off/no pressure when started


Try checking with either propane or water mist on all hoses and surfaces where generated vacuum could escape.

Activator rod from Brake pedal to Master cylinder can be adjustable on some models.

Jul 20, 2017 | Ford C Cars & Trucks

1 Answer

How to remove plastic bracket that holds brake lines for 2002 GMC yukon


The related help,link,to troubleshoot the problem is as follows:--
Click the link below:---
Car Brake lines have no pressure? http://schematicsdiagram.blogspot.com/2011/12/car-brake-lines-have-no-pressure.html

--------
Brake line pressure issue? http://schematicsdiagram.blogspot.in/2012/04/2000-silverado-brake-line-pressure.html

---------
How to fill Brake line antifreeze? http://technoanswers.blogspot.com/2012/01/how-to-fill-brake-line-antifreeze-on.html

----------
This will help.
Thanks.

Jul 17, 2012 | 2002 GMC Yukon XL

1 Answer

The brake system on a 2002 dodge durango has no pressure


Do you actually see brake fluid coming from the bleeders? Check for a broken brake line. If no fluid is being lost and the peddle has proper pressure, then the brake booster has failed. If their is no pressure at all, then the master cylinder has failed. Replace accordingly.

Dec 05, 2011 | 2002 Dodge Durango

1 Answer

2005 jeep grand cheroke limited with A hemi, been to the dealer more times then I can count, and still to this day the same problem. The service elect brake system light illuminates intermit and so for...


The braking force of the rear wheels is controlled by electronic brake distribution (EBD). The EBD functions like a rear proportioning valve. The EBD system uses the ABS system to control the slip of the rear wheels in partial braking range. The braking force of the rear wheels is controlled electronically by using the inlet and outlet valves located in the HCU. The HCU is a Hydraulic control unit. The HCU consists of a valve body, pump motor, and wire harness.

Did they check for DTC (diagnostic trouble codes) in the system? if so, what were they?

Accumulators in the valve body store extra fluid released to the system for ABS mode operation. The pump is used to clear the accumulator of brake fluid and is operated by a DC type motor. The motor is controlled by the ABM.
The valves modulate brake pressure during antilock braking and are controlled by the ABM.
The HCU provides four channel pressure control individually to all the front and rear brakes. Each of the four channels control the rear & front wheel brakes individually.
During antilock braking, the solenoid valves are opened and closed as needed. The valves are not static. They are cycled rapidly and continuously to modulate pressure and control wheel slip and deceleration.
During normal braking, the HCU solenoid valves and pump are not activated. The master cylinder and power booster operate the same as a vehicle without an ABS brake system.
During antilock braking, solenoid valve pressure modulation occurs in three stages, pressure increase, pressure hold, and pressure decrease. The valves are all contained in the valve body portion of the HCU.


PRESSURE DECREASE The outlet valve is opened and the inlet valve is closed during the pressure decrease cycle.
A pressure decrease cycle is initiated when speed sensor signals indicate high wheel slip at one or more wheels. At this point, the ABM closes the inlet then opens the outlet valve, which also opens the return circuit to the accumulators. Fluid pressure is allowed to bleed off (decrease) as needed to prevent wheel lock.
Once the period of high wheel slip has ended, the ABM closes the outlet valve and begins a pressure increase or hold cycle as needed.


PRESSURE HOLD Both solenoid valves are closed in the pressure hold cycle. Fluid apply pressure in the control channel is maintained at a constant rate. The ABM maintains the hold cycle until sensor inputs indicate a pressure change is necessary.


PRESSURE INCREASE The inlet valve is open and the outlet valve is closed during the pressure increase cycle. The pressure increase cycle is used to counteract unequal wheel speeds. This cycle controls re-application of fluid apply pressure due to changing road surfaces or wheel speed.

Nov 09, 2010 | 2005 Jeep Grand Cherokee

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