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No brake pressure when motor started - 1996 Ford Explorer

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Bleed out the air in the brake system starting at the longest line first. Check for fluid leaks as you go as you may have a leaking hose or unit that has drained out the reservoir. It still no brakes replace the master cylinder.

Posted on Oct 13, 2013

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1988 lincoln mark vii abs light stays on and hard breaks


The ABS unit has failed and needs to be replaced.

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1988 lincoln mark vii abs light stays on and i have hard breaks


ABS sensor in the brake hubs are bad, get a brake job.

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I have hard breaks on my 1988 lincoln mark vii and my abs light stays on any help


Bad vacuum brake booster test booster by shutting car off and don not touch pedal open hood and remove hose to booster a wooosh sound should be heard if not need a booster.

May 13, 2014 | 1988 Lincoln Mark VII

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With motor shut off, I have good break pressure, but when the motor is started, the pedal goes to the floor.


Was the entire not bleed at all?

Master cylinders do not fail as fast as
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They are replaced but never because they fail
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When the car is off you are pressing against the power
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Nov 24, 2012 | 1994 Buick Park Avenue

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WHY ARE BRAKES SO HARD TO PRESS ON 90 LINCOLN MARK VII?


The power brakes vacuum booster... may have a vacuum leak. you can check it with an engine vacuum meter, or remove the rubber hose from the booster and plug it.. and see if the engine changes pase, idle smooths out, revs a bit higher, etc. noticeable change in engine idle would confirm a leak.

Oct 01, 2012 | 1990 Lincoln Mark VII

1 Answer

Hyraulic brake pump is bad i need a replacement


Are you sure the hydraulic motor is bad?....as it's usually a problem with a relay and/or the pressure switch.

LEARNING ABOUT THE "TEVES" BRAKE SYSTEM
The hydraulic brake booster on a late model Mark VII and early Continental is very different from most. It is equipped with something known as a "TEVES" brake system.
The main parts in the system that we will discuss include an ACCUMULATOR, a HYDRAULIC PUMP, a hydraulic pump RELAY, and a PRESSURE SWITCH. These are the key players in this operation.

THE LOCATION OF THESE PARTS ARE AS FOLLOWS:
HYDRAULIC PUMP MOTOR= Underneath the brake assembly (2 pin connector) Hydraulic pump motor
RELAY = On the drivers side strut tower
PRESSURE SWITCH = 5 pin connector facing the # 7 or 8 spark plug(drivers side)
ACCUMULATOR = Round black ball on the drivers side

WHAT THESE ITEMS DO:
HYDRAULIC PUMP MOTOR is an electric hydraulic pump used to "boost" pressure for the brake assembly. This pump is $900 new!
hydraulic pump motor RELAY is just what its sounds like. It gives the hydraulic pump motor power to come on.
PRESSURE SWITCH is the "brains" in the system. It senses how much pressure is "on line", and when the system needs more pressure, it tells the relay to "power up" the hydraulic pump motor.
Another one of its jobs is to turn on the RED BRAKE LIGHT, then the ANTI-LOCK lights to alert the driver that the pressure is dangerously low. (The reason the anti-lock light comes on, is because the ABS cannot function if there's a problem with the manual brakes)
ACCUMULATOR stores energy or pressure like a reservoir. Its there so the hydraulic pump motor only has to come on every 3rd or 5th time. Its design is more complicated, but basically the same principle as an air tank on a compressor.

WHAT NORMALLY HAPPENS:
What usually happens is, in time, the accumulator gets weak with age and can't hold the pressure like it was designed too, and therefore, the hydraulic motor comes on every time the brakes are applied....rather than every 3rd or 5th time. This means all these parts are working 3 or 5 times more than they were designed to. This puts an extreme amount of pressure on an already old system.
What we know from this is, the accumulator needs replacing because it's what started all this, but now the pressure switch and relay needs replacement also because it has worked overworked.
NOTE: always replace the relay when replacing the pressure switch. The relay came on every time the pressure switch told it too, so if one is worn out....the others not far behind!
hyraulic-brake-pump-bad-need-replacement-q5d1cnsm5fkb13bp03i0fxgj-5-0.gif

Sep 09, 2012 | 1990 Lincoln Mark VII

2 Answers

When antilock brake and brake lights are on and pedal is hard to push and stop.What is typical on a 1990 lincoln mark seven


LEARNING ABOUT THE "TEVES" BRAKE SYSTEM
The hydraulic brake booster on a late model Mark VII and early Continental, is very different from most. It is equipped with something known as a "TEVES" brake system. I'll attempt to teach you what does what and why, so you won't spend a ton of money just because you and maybe your mechanic aren't familiar how it works. The way it's always been is,..."if you don't understand it...replace the whole thing"! The problem with using this technique is, unless you want to spend $2K for the whole thing, your going to be buying a used system....which may not be a whole lot better than the one you have now.
The main parts in the system that we will discuss include an ACCUMULATOR, a HYDRAULIC PUMP, a hydraulic pump RELAY, and a PRESSURE SWITCH. These are the key players in this operation.

THE LOCATION OF THESE PARTS ARE AS FOLLOWS:
HYDRAULIC PUMP MOTOR= Underneath the brake assembly (2 pin connector) Hydraulic pump motor
RELAY = On the drivers side strut tower
PRESSURE SWITCH = 5 pin connector facing the # 7 or 8 spark plug(drivers side)
ACCUMULATOR = Round black ball on the drivers side

WHAT THESE ITEMS DO:
HYDRAULIC PUMP MOTOR is an electric hydraulic pump used to "boost" pressure for the brake assembly. This pump is $900 new!
hydraulic pump motor RELAY is just what its sounds like. It gives the hydraulic pump motor power to come on.
PRESSURE SWITCH is the "brains" in the system. It senses how much pressure is "on line", and when the system needs more pressure, it tells the relay to "power up" the hydraulic pump motor.
Another one of its jobs is to turn on the RED BRAKE LIGHT, then the ANTI-LOCK lights to alert the driver that the pressure is dangerously low. (The reason the anti-lock light comes on, is because the ABS cannot fuction if theres a problem with the manual brakes)
ACCUMULATOR stores energy or pressure like a reservoir. Its there so the hydraulic pump motor only has to come on every 3rd or 5th time. Its design is more complicated, but basicaly the same principle as an air tank on a compressor.

WHAT NORMALLY HAPPENS:
What usually happens is, in time, the accumulator gets weak with age and can't hold the pressure like it was designed too, and therefore, the hydraulic motor comes on every time the brakes are applied....rather than every 3rd or 5th time. This means all these parts are working 3 or 5 times more than they were designed to. This puts an extreme amount of pressure on an already old system.
What we know from this is, the accumulator needs replacing because it's what started all this, but now the pressure switch and relay needs replacement also because it has worked overworked.
NOTE: always replace the relay when replacing the pressure switch. The relay came on every time the pressure switch told it too, so if one is worn out....the others not far behind!
when-antilock-brake-brake-lights-q5d1cnsm5fkb13bp03i0fxgj-5-0.gif

Jun 08, 2011 | 1990 Lincoln Mark VII

1 Answer

With motor started and driving, brakes act and feel like no power. On air pressure cover service manual # is 2820134. Fluid is good.


Hello this is most likely your brake power booster this device boost air from the engine to boost brake pressure to your brakes it is located on the other side of your brake pedal under the engine compartment attached to your brake master cylinder brake fluid reservoir.

Jan 08, 2011 | 1991 Dodge Grand Caravan

1 Answer

What is a abs motor 96 explorer


It is the electric motor that is intgrated into the ABS(Anti-lock Brake System). This motor is activated to supply brake fluid pressure to the correct wheels during a skid or brake lock-up so the master cylinder can be active and still let brake pressure be released to the wheels that are skidding. This motor is commonly replaced as a unit with the brake controller assembly.

Hope this helps.

Apr 20, 2009 | 1999 Ford Explorer

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