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        General >> Problems >> NO PRESSURE AT REAR CALIPERS.ANY HELP PLEASE?
        
(Message started by: edjog on Feb 8^th, 2006, 7:17pm)

Title: NO PRESSURE AT REAR CALIPERS.ANY HELP PLEASE?
Post by edjog on Feb 8^th, 2006, 7:17pm

Anyone had this problem?.Took my 12v ultima for test and it failed on both sides of the rear brakes.Bought new pads and booked into garage for repair.Went to collect expecting a new m.o.t. only to be told that they didnt know what the fault was.Both pistons are free yet the fluid doesnt seem to be getting to the calipers as there isnt any pressure.Both front brakes are o.k.A.B.S. light sometimes comes on but isnt on all the time.Can anyone help please!

Title: Re: NO PRESSURE AT REAR CALIPERS.ANY HELP PLEASE?
Post by Paul B on Feb 8^th, 2006, 7:33pm

Must be a dodgy pipe or something somewhere :-/

How's the fluid level in the resevoir?

Title: Re: NO PRESSURE AT REAR CALIPERS.ANY HELP PLEASE?
Post by edjog on Feb 8^th, 2006, 7:57pm

Hi Paul,Fluid level is fine.On disconnection of the brake flexy hose there is fluid there yet doesnt seem to be any pressure to it even when the engine is running and the brake pedal is deppressed.Stumped me and the garage mechanic?.

Title: Re: NO PRESSURE AT REAR CALIPERS.ANY HELP PLEASE?
Post by Snoopy on Feb 8^th, 2006, 8:02pm

Sounds as though the master cylinder could be at fault That is where I would be looking. if fluid is present in the pipes at the rear brakes .

Title: Re: NO PRESSURE AT REAR CALIPERS.ANY HELP PLEASE?
Post by edjog on Feb 8^th, 2006, 8:25pm

Thanks for that Snoopy.Front brakes are working fine and so the mechanic at the garage didnt suspect the master cylinder.Will have it checked a.s.a.p.

Title: Re: NO PRESSURE AT REAR CALIPERS.ANY HELP PLEASE?
Post by Simmo on Feb 8^th, 2006, 8:44pm

Have you looked at this http://www.fordscorpio.co.uk/abssystem.htm. Reading through the description of how it works it appears there is a 'modulator' which distributes the pressure through three pipes. Two feed the front brakes and ONE feeds the rear brakes. There is also a post which details how to replace the modulator if that is needed. That post talks about the ABS light coming on intermittently as you mention.

Title: Re: NO PRESSURE AT REAR CALIPERS.ANY HELP PLEASE?
Post by edjog on Feb 8^th, 2006, 10:39pm

Thanks very much Simmo.I will have a look and set to it as soon as i get the time.Will let everyone know the outcome.Thanks again to all for your help.

Title: Re: NO PRESSURE AT REAR CALIPERS.ANY HELP PLEASE?
Post by howiedintheplace on Feb 9^th, 2006, 5:48am

Yeah the system is split into two.
Fronts work on a different circuit to the back.
Got to be your modulator block.
Most cars have this kind of system can't think why your machanic wouldn't know ???

Title: Re: NO PRESSURE AT REAR CALIPERS.ANY HELP PLEASE?
Post by edjog on Feb 9^th, 2006, 7:14pm

Hello to all.I have today done a thorough inspection of the brake circuit and found that on the modulator block there are three outlet fluid pipes,two of which have fluid present and one has none so i presume that this one(closest to front of vehicle)is the feed to the rear callipers.Can anyone tell me if the modulator is repairable or not or better still has any of you guys got one for sale then maybe i could swap them over to try eliminate the problem.Regards to all.

Title: Re: NO PRESSURE AT REAR CALIPERS.ANY HELP PLEASE?
Post by howiedintheplace on Feb 10^th, 2006, 8:38am

If your car has traction control I have one.

Title: Re: NO PRESSURE AT REAR CALIPERS.ANY HELP PLEASE?
Post by edjog on Feb 10^th, 2006, 11:35am

Not clued up on that one.Shes a 1995 ultima 2.9 12v on an M plate.How could I tell if traction control is fitted? She is now doing my ed in and will probably end up for sale on ebay.Pity though,only failed test on rear brakes.

Title: Re: NO PRESSURE AT REAR CALIPERS.ANY HELP PLEASE?
Post by Snoopy on Feb 10^th, 2006, 5:38pm

the 12v does NOT have traction control

all you will need most probably is a new ABS pump assembly IMHO

see here for info http://www.fordscorpio.co.uk/absmodulator.htm

Title: Re: NO PRESSURE AT REAR CALIPERS.ANY HELP PLEASE?
Post by howiedintheplace on Feb 10^th, 2006, 6:14pm

Thanks Snoopy.
I ain't got one for a non t/c.

You could just replace your alloy block & use your old brain I think but as the ABS light comes on sometimes I would replace the whole thing.

Title: Re: NO PRESSURE AT REAR CALIPERS.ANY HELP PLEASE?
Post by Snoopy on Feb 11^th, 2006, 10:03am

The ABS Modulators are as follows there is one for cars with Traction control 95/98 Finis 7086802

And two for cars without TC as they modified the unit after 96 .... BUT both fit and are compatable...
Finis for those is 7087346 94/96 and post 96 1033504

So as long as you get one of a car without TC it will do the job.