1988 Lincoln TC message center says "Brake Pressure"
The brakes are spongy but will pump up. Vac boost appears to be working because after bleeding down the vac, pressing the brake and starting the engine, the pedal drops slightly.
There is no explanation in the owner's manual as to what this warning really means. I am suspecting the master brake cylinder, but am also concerned it may be the distribution valve or the vac boost. Is there a way to know for sure? The brakes were getting spongy, but the message didn't appear until after I replaced the rear brakes.
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Re: 1988 Lincoln TC message center says "Brake Pressure"
If the pedal keeps dropping the master cylinder is probably going bad (most common). Another tip is the rear brake pads hold the pedal height. Check your rear pads to see if they are low or need replacing. Most brake shops do a free inspection so I would let them do the leg work for you. Go to a reputable shop or if unsure get multiple estimates before performing the work
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Do you have an electronic brake pressure pump for brake assist that you may want to make sure works properly. When turning ignition on, you should hear the motor run, also when you press the brake pedal.
you still have some air in the lines. go back thru the bleed process again if that doesn't work, get to a power brake bleeder.(amazon about$70) that is a system that puts pressure on top of mc to push fluid thru the system as you open bleed screws. did you know you can adjust brakes by holding down lock button and pumping emergency brake handle. good luck
COMPLETE BRAKE SYSTEM NEEDS BLEEDING!, REMOVE BRAKE FLUID FILLER CAP TOP UP THE BRAKE FLUID IF LOW, RAISE THE VEHICLE & REMOVE THE WHEELS FOR EASE OF ACCESS THEN CRACK OFF THE BLEED NIPPLES ONE AT A TIME ATTACH HOSE TO A RECEPTACLE SUCH AS A JUG OR BUCKET & GET A FRIEND /WIFE/PARTNER/NEIGHBOR TO PUMP THE BRAKE PEDAL ON EACH BRAKE, WHEN NO AIR BUBBLES ARE SEEN & BRAKE FLUID RUNS CONTINUOUSLY REMOVE HOSE & TIGHTEN BRAKE BLEED NIPPLE, DO THIS THREE MORE TIMES ONCE ON EACH CORNER, NOT FORGETTING TO KEEP TOPPING UP THE BRAKE FLUID RESERVOIR OTHERWISE YOU WILL GET MORE AIR IN THE LINES & HAVE TO START ALL OVER AGAIN, ONCE DONE PUT THE WHEELS BACK ON , LOWER THE VEHICLE, MAKE SURE THE RESERVOIR IS AT THE RIGHT LEVEL & PUMP THE BRAKES A FEW TIMES, THE SPONGINESS WILL HAVE DISSIPATED & YOUR BRAKES WILL BE MUCH MORE RESPONSIVE.
You need to adjust up the rear brakes and also check back there for leaking wheel cylinders and maybe even a bad bearing in the axle assembly, worn shaft,accompanied by a leaking axle seal that will appear really nasty and smell bad too...
I have also seen this model with a crappy pedal when the brake hoses have become softened and expand under pressure
JEEP VECHICLES 2001 MODELS AND UP HAS TO BE BLED USING A DRB BLEED TOOL.YOU HAVE TOW VECHICLE IN.MOST TIME YOU CAN TRY MANUAL BLEEDING BUT BRAKES WILL BE SPONGY AND ABS LIGHTS WILL TURN ON.THE DEALERSHIP HAS TO BLEED IN ORDER TO GET GOOD SOLID BRAKES AGAIN.
OK, there are little nipples or bleeder screws that when not rusty and new can be turned with a small wrench or socket.
The problem is that when they get old and rusty, they can shear off or round off the hexagonal sides and corners of the bleeder screw.
Therefore, you sometimes need some oxy acetylene torch heat pinpointed on the bleeder screw to let air and brake fluid out of each wheel's bleeder screw (through the hole in the center).
If you only add brake fluid, then air bubbles can still exist in the sensitive brake lines, causing a spongy pedal and endangering anyone who drives it.
One wants a hard pedal that pumps up in a couple of tries, not a spongy pedal that goes to the floor board, which doesn't generate much braking force.
FIrst, pump up the brakes to maximum pressure by pumping the brake pedal up and down.
Then, on the down cycle (a friend or assistant can do this), open the bleeder screw counter clockwise until fluid comes out. Don't allow any in your eyes. Then tighten the bleeder screw and ask the assistant to pump up the brakes again, and then repeat the cycle on the 4 different wheels, until it has a 'hard' pedal and not 'soft.'