Mechanics

REAR BRAKE PRESSURRE UNEVEN

1996 Ford Mondeo

Left pressure 260 right 140
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Ray5776
January 1, 2012.




Either a bad brake hose, or caliper/wheel cylinder.

Merlin2021
Jan 1, 2012.
HOW ARE YOU GETTING THESE PRESSURE READINGS? AT WHAT LOCATIONS? HOW ARE YOU PRESSURING THE PEDAL? GOT A GAGE ON BOTH SIDES BEING READ SIMULTANEOUSLY?

JUST SORTA WANT TO KNOW THE PROCEDURE

THE MEDIC

Tiny
CJ MEDEVAC
Jan 1, 2012.
Using a brake test machine, front axle ok, hand brake also ok, rear axle uneven after replacing right caliper and pads

Tiny
Ray5776
Jan 1, 2012.
Which number is within tolerence the 260 or the lower number 140

Tiny
Ray5776
Jan 2, 2012.
Always replace hydraulic units in pairs
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Merlin2021
Jan 2, 2012.
EVEN WITH DOING THE PAIR THING.....THE "WHY" IS MY PROBLEM

LOOKS LIKE THE ONLY WAY (TO ME) TO HAVE DIFFERENT PRESSURES ON A SYSTEM BEING PRESSURED IDENTICALLY IS FOR THE CALIPER PISTONS TO BE DIFFERENT DIAMETER

AS WITH ALL THE WAY AROUND DRUM BRAKES, EVERYTHING IS IDENTICAL EXCEPT THE BORE SIZES OF THE WHEEL CYLINDERS---LARGER ON THE FRONT BRAKES---SMALLER ON THE REAR BRAKES READ THE INFO ABOUT THE 2ND AND 3RD ITEMS IN THIS LINK

http://www.kaiserwillys.com/category/willys-jeep-brakes-wheel-cylinders-parts-accessories

YOU HAVE BROUGHT UP A GOOD QUESTION

WHAT IF YOU DID CHANGE BOTH CALIPERS---THE LEFT ONE WAS MADE BY "LITTLE INDUSTRIES" AND THE RIGHT ONE WAS MADE BY "BIG INDUSTRIES"---AND LETS SAY THE PISTON SIZES ARE DIFFERENT----WILL YOU BE IN THE EXACT SAME SITUATION AS YOU ARE NOW???

IS THEIR A DIFFERENCE SOMEWHERE THRU THE LINE--OR THE YEARS---OR THE COUNTRIES IT'S SOLD TO??? THIS IS CAR IS THE SAME BASE AS A FORD CONTOUR AND A MERCURY MYSTIQUE

YOU HAVE ME WONDERING, AND YOU MAY HAVE STUMBLED ONTO A GLITCH NO ONE ELSE CAUGHT

BEING A PLUMBER---EVEN A RESTRICTED LINE IN A WATER SYSTEM WILL BUILD THE SAME PRESSURE---FLOW OR VOLUME WILL ONLY DIFFER---SO YOUR DILEMMA DOES MOT MAKE SENSE---UNLESS THERE IS A SIZE DIFFERENCE

JUST TRYING TO HELP

IF YOU FIND THE PROBLEM/ REASON, PLEASE LET US KNOW

THE MEDIC

Tiny
CJ MEDEVAC
Jan 2, 2012.
No it's caused by sludge build up around the pistons, thats why calipers are replaced in pair, to AVOID this problem, which will cause uneven wear from side to side. Replace left caliper and retest your pressures.

Merlin2021
Jan 2, 2012.
Kinda silly to use the pressure tool and not have that info?

Merlin2021
Jan 2, 2012.
Problem found replaced (PRCV) power releif control valve, mounted on rear axle controls pressure on calipers, replaced both sides, brakes passed brake test.

Tiny
Ray5776
Jan 4, 2012.
Great.

Merlin2021
Jan 4, 2012.

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