Hydraulic Handbrakes

Jun 03, 2004 6 Replies
M

In addition to the parking brake, fitted without button ;-)



Can they be fitted in 'series' with the main braking system - line from master cylinder through handbrake and to the wheel - push pedal brakes work as normal, pull handbrake applies rears only - or will I get problems with the brakes not 'freeing off' after application? As I can see I shouldn't - as you can push pistons back into cylidners with the brake pedal up and fluid flows straight through the master cylinder, but does anybody have any experience?


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S

Not allowed afaik. The parking brake must be independant of the main brake.

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D

He dose say it's to be in addition to his existing parking brake.

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M

That's what we thought last time I asked - so this time in addition to a (now cabled) transmission/parking brake is legal - but can it be done on the same hydraulic circuit or does it need aother caliper/slave.

As I can see if I plumb a master cyli in series with the rear brakes, and leave enough free-play in the lever such that the check-valve in the handbrake master cylinder doesn't activate it should work?

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B

Well but he's still planning to put it in series with the main braking system. What if there's a failure eg: hydraulic leak somewhere?? you've got no backup braking system.

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C

He uses the cable handbrake, as he's said!

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M

I would still have front brakes (the master cylidner pistons collapse into eah other, sealing off the rear brakes and leaving braking on the fronts); and I'd still have the transmission brake. Its legal, I just want to know if it'll work...

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