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Hydraulics don't work

I have replaced the pump and the hydraulics still don't work

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If you didnt mix the hoses try to bleed losen one hose a bit till fluid pumps out and retighten

Posted on Sep 07, 2014


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Radiator fan hydrualic car is over heating as it is not working anything i need to know thermostat or just replace it the fan

Is this a Lincoln LS? Some have contaminated the hydraulic fluid by adding coolant to it mistakenly.
The hydraulic fan is controlled by a solenoid /actuator and the computer runs it. here's a link you can do some reading and searching on:

don-ohio (:^)

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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.

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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? it's usually a problem with a relay and/or the pressure switch.

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.

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

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 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!

Sep 09, 2012 | 1990 Lincoln Mark VII

1 Answer

Jeep cherokee limited 1991 (with abs) brakes wont work

I don't see why not.
Technically, the hydraulic brake system works independently from the ABS. The ABS system uses the regular hydraulic system to function.
So your regular hydraulic system should work even with the ABS system in place.

Sep 01, 2012 | 1991 Jeep Cherokee Limited

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