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Which rear calipers for hydraulic handbrake
westy turbo - 17/4/09 at 05:24 AM

Morning!allready got the front powerlites and a hydraulic handbrake from RDwhich rear calipers will work with that set up?

clairetoo - 17/4/09 at 06:07 AM

As far as I know , a hydraulic handbrake wont pass SVA/IVA or MOT , as the handbrake has to be a separate mechanical brake ?

speedyxjs - 17/4/09 at 06:08 AM

You need to have a mecanical handbrake aswell.

britishtrident - 17/4/09 at 07:01 AM

From my understanding of the way the law is currently being interpreted the mechanical handbrake has to worked by the same lever.

westy turbo - 17/4/09 at 08:04 AM

As the car will not have to go through mot/sva regulations cause its not road legal.only need to find out which calipers to use and how to split/fit the brake set up
Thanks Aris

trogdor - 17/4/09 at 08:45 AM

I got the impression that you can legally have a hydraulic handbrake but the system has to be completely separate to the brakes.

I assume that means you would need separate callipers for the handbrake etc

I could be wrong tho

Agriv8 - 17/4/09 at 08:52 AM

Hijacking this post a bit and Playing devels advocate (going back to a setup we had on a road legal ? racer ).

Lets say we have

Mechanical ( ratchet handbrake ) operating it own Master Cylinder (and resvior) running through independant brake lines and second set of calipers Should it pass an MOT ?

I would say yes ( as we got it through that the parking break system was indipendant foot breaking system ) but the didnt like that it was hydralic saying it could leak fluid loose presure - So we pointed out the a cable could streach / break and they finally aggreed to give us a ticket after much flicking throught the MOT book ( well over 10 years ago BTW ).

discuss ?

regards

Agriv8

britishtrident - 17/4/09 at 03:10 PM

quote:
Originally posted by trogdor
I got the impression that you can legally have a hydraulic handbrake but the system has to be completely separate to the brakes.

I assume that means you would need separate callipers for the handbrake etc

I could be wrong tho



Your wrong ---- with good reason the parking brake has to be mechanical in operation although the initial actuation can be by other means (eg usually electrical), everything that keeps the brakes applied to the disc or drum has to be purely mechanical. Hydraulic systems leak & hot fluid contracts so hydraulics cannot provide a reliable handbrake for overnight parking.

[Edited on 17/4/09 by britishtrident]

britishtrident - 17/4/09 at 03:13 PM

quote:
Originally posted by John Bonnett
I'm sorry Aris, none of us answered your question, we all leapt in about the legal angle.

I cannot help you with the selection of calipers and can only pass on my experience.

On the Trials car I'm running a hydraulic handbrake which I made myself using a Girling master cylinder as shown in the photograph. The port on this master cylinder that normally goes to the remote reservoir is connected instead to the rear brake pipe from the main master cylinder. The other port takes the pipe to the rear brakes. I'm using Citroen AX calipers and this set up works fine.
I hope this goes a small way to helping.

atb

John


I have seen system before on works Escorts and it scares the pants off me --- too much chance of things going wrong.

Also as it constitues a means of altering the brake effort distribution of the service I am pretty sure it is an SVA fail if not downright illegal.

britishtrident - 17/4/09 at 03:18 PM

quote:
Originally posted by westy turbo
As the car will not have to go through mot/sva regulations cause its not road legal.only need to find out which calipers to use and how to split/fit the brake set up
Thanks Aris


Then you don't need any kind of handbrake.

westy turbo - 17/4/09 at 07:14 PM

Of course i do and its gonna be a hydraulic 1

MikeRJ - 17/4/09 at 10:20 PM

quote:
Originally posted by britishtrident

I have seen system before on works Escorts and it scares the pants off me --- too much chance of things going wrong.


Pretty much every tarmac rally car I have ever seen has used the same system, it can't be that unreliable.