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[jay140285]

Right,

Symptoms are front brakes are sticking on, pedal goes hard and there is a mental judder through the steering wheel.

New calipers fitted, still no better, new brake lines as it was thought these could have degraded over time, Bubba replaced the brake fluid and all seemed good on his test drive.

Going home from Kevs it seemed so much better, then bang judder back and brakes on.

We spoke and unplugged the ABS sensors to see if this made a difference and initially it did seem better just a very minor pulse through the pedal still but driveable unlike before.

Took it out this morning and back to square one, brake pedal is rock hard and front brakes stuck on.


Anyone got any idea's as to what could be at fault here.

[steveo]

dont know much about wjs, but if the disc s are not warped then it must be up tother end,master cylinder sticking ? servo problem? can the servo be disconnected, just to try it out ?

[isle of man]

Faulty ABS sensor, dirty/loose exciter ring, these are two that come to mind.

[Cockney Boy]

  anything electronic, you really need to do a fault scan, your wasting time and money without one.

[bigjeepzj]

 Abs pump stuck valve

[isle of man]

Abs pump stuck valve

Yep, that's a possible.

[Bubba]

its an interesting one for sure  one abs sensor is shot for sure but the pedal becoming  hard would to me say either undrivebly warped discs or point to the master not letting fluid return properly [the fluid  was thick like raw egg and and the colour of duckhams engine oil ] very odd no codes showing when  it left either

[isle of man]

its an interesting one for sure  one abs sensor is shot for sure but the pedal becoming  hard would to me say either undrivebly warped discs or point to the master not letting fluid return properly [the fluid  was thick like raw egg and and the colour of duckhams engine oil ] very odd no codes showing when  it left either

Well, this has basic economics all over it!!!

Go for the cheaper option first and dig deeper as you progress.

[MOCAJ]

long shot here, if it has a proportional valve are all wheels locked up when pedal depressed, check that first

if not i would go master cylinder fooked

[jay140285]

Cheers for the idea's chaps.

I have got Discs, ABS sensors and a master cyclinder coming from Carlos on Friday.

Then its back to Kev,

Fingers crossed doing all the above gets results.


Steve, no not all wheels lock up, just the fronts becoming stuck on, TBH the rears may be slighty on but nothing like the fronts.

[donk498]

Have you tried pulling the abs fuses. Or disconnecting the abs ecu and trying it, so there's no power to the modulator. Would help track it down to electrical or mechanical fault.

[JamesH]

Sounds like ABS could be a problem, do what donk says to turn it off and diagnose the basic breaking system separately.

[Lukemagnum]

You don’t mention what year the WJ is, on a 2003 the ABS Hydraulic Control Unit has 3 channels, one channel controls the rear wheel brakes in tandem, the two remaining control the front wheel brakes individually. It would need identical faults on both front channels of the HCU actuator valves for both fronts to be locked up together, seems unlikely.

The master cylinder however has a primary piston for the front and a secondary piston for the rears, so I would look there first.

[UKJeeper]

You don’t mention what year the WJ is..

It does say (in at least 2 places, in his profile and sig) that it's a 60th anniversary edition. Which makes it a 2001.

[Lukemagnum]

So it does - smacked wrist for not paying attention. Although I was trying out that multi-tasking thing at the time.

[UKJeeper]

So it does - smacked wrist for not paying attention. Although I was trying out that multi-tasking thing at the time.

To be fair, it's probably due to Jhay having the entire brake system chromed...

[xr6jeeper]

Is it possible that the return spring in the master cylinder is fooked, or shite in the front brake line stopping the fluid returning 

[jay140285]

Tim - Twat lol,

Brake lines replaced.

Will do as suggested in the morning re ABS as at the moment I have both front sensors un plugged.

It is the pedal going hard that it is the main issue and when it does the fronts are on, not saying the rears are not slightly on either but fronts are on firm.

Picking up, discs, ABS and Master cylinder in the morning first thing.

[bluevanman]

might be a long shot but i had a fiesta in once with similar problems turned out to be adjustment on the back of the master cylinder (locknut came loose) dunno if the wj has a similar system if it does at least its a free fix

[Bulldog67]

So it does - smacked wrist for not paying attention. Although I was trying out that multi-tasking thing at the time.

To be fair, it's probably due to Jhay having the entire brake system chromed...

  missed this

[Bubba]

already considered this you cant get to check adjustment untill the master is pulled away from the servo

[jay140285]

 Fixed!

Cheers Bubba

[gazjeep]

What was the issue in the end ?

[jay140285]

All problems steamed from the master cylinder.

Sorted now with pretty much new everything on the braking system lol.

[Bulldog67]

ahhh the old kettle trick eh, often works