1987 Ford Escort BRAKE PRESSURE

ROBERTTHORNBURG

MEMBER
1987 FORD ESCORT
4 CYL
FWD
AUTOMATIC
187,000 MILES

IM HAVING TROUBLE GETTING PRESSURE TO ALL WHEELS I'VE REPLACED MASTER AND REAR WHEEL CYLS. AND RIGHT FRONT BRAKE LINE AND BOOSTER REDONE FRONT BRAKES AND REAR THE MAIN PROBLEM IS THAT I CAN GET PRESSURE AT LEFT FRONT AND RIGHT REAR BUT NOT THE OTHER TWO CORNERS I AM AT A TOTAL LOSS I HAVE REPLACE THE MASTER TWICE TO RULE OUT THE NEW MASTER BEING BAD. THE ONLY THING I HAVEN'T REPLACE IS THE PROPORTIONIG VALVES FIND THEM ARE NOT ALL THAT EASY BECAUSE OF AGE OF VEHICLE BUT DID INSPECT THEM AND CLEAN THEM THEY SEEM TO BE FINE AND I DID BLEED THEM IN THE CORRECT ORDER RR TO LF AND AGAIN LR TO RF AND SPECIFIED IN THE BLEADING PROCEDURE MANUAL IM GOING BALD OVER THIS ONE

5 Replies

MERLIN2021

MECHANIC
17,250 POSTS

Are you getting pressure at the master? Start at master and work your way back. This is a diagonal brake system, and it is split rr, LF as a pair off the master, and lr rf as a pair. You did bench bleed the master first? If not, get some brass plugs and install them on the master, pump gently until the pedal will not move, now all air is out, attach lines and bleed them, then bleed at wheels. Do not allow the master to run dry!

SPONSORED LINKS

Was this

answer

helpful?

Yes

No

Wednesday, January 30th, 2008 AT 8:33 AM

ROBERTTHORNBURG

MEMBER
7 POSTS

IN FACT I DID BENCH BLEED THE MASTER AND AS STATED I DID BLEED IN CORRECT ORDER AS THE DIAGONAL SYSTEM BUT STILL NO LUCK PLEASE READ MY QUESTION AND PROBLEM THANK YOU FOR YOUR HELP

Was this

answer

helpful?

Yes

No

Wednesday, January 30th, 2008 AT 10:27 AM

MERLIN2021

MECHANIC
17,250 POSTS

You still did not answer my question, if you remove the lines at the master, does the MASTER have good pressure? If yes you either have a LEAK, or a bad Prop valve. And a LOW pedal?

Was this

answer

helpful?

Yes

No

Wednesday, January 30th, 2008 AT 5:50 PM

MERLIN2021

MECHANIC
17,250 POSTS

I did re read your answer and still did not see a mention of BENCH bleed of master?

Was this

answer

helpful?

Yes

No

Wednesday, January 30th, 2008 AT 5:53 PM

ROBERTTHORNBURG

MEMBER
7 POSTS

I DID BENCH BLEED THE MASTER AND I CHECK AND TOOK APART THE PROP VALVES IF YOU PUMP THE BRAKE YOU HAS A PEDAL BUT AN INITIAL ONE PUMP THERE IS NO PEDAL AND THE MASTER HAS GOOD PRESSURE ITS THE THIRD MASTER TO RULE OUT A BAD NEW MASTER I HAVE GOOD STOPPING POWER AT THE LEFT FRONT AND RIGHT REAR THE CAR IS SITTING OUT BACK OF THE SHOP JUST WAITING B/C I AM AT A LOSS OF THE REPAIR I ALSO HAD A SIMILAR PROB ON A TAURUS AND COULD NOT REPAIR IT EITHER I AM REALLY CURIOS TO FIGURE THIS ONE OUT AND CANT THINK OF WHAT IT COULD BE I DO APPRECIATE YOUR HELP
THANK A LOT