Electronic Brake Via M/C

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chimpvalet
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Electronic Brake Via M/C

Post by chimpvalet »

Greetings

Work underway on custom brake system for 2 cars, 4 wheel disc, '70's sportscar, and trying to replace the OEM set-up which places the handbrake lever in a terrible location on the driver's doorsill, so must be crawled over when set. We know EPB integral calipers are out there but would prefer the more firmly mounted fixed type over sliders, which is what the current EPB set-ups all seem to use. Is there any reason why not to link a compact linear actuator to a twin master cylinder set on balance bar, if carefully designed?

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Steve
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Re: Electronic Brake Via M/C

Post by FC-Pilot »

You could get a drum in hat park brake and put an actuator on the end of the cable. Have it mounted in the center console so you can access and adjust as needed while still maintaining the fixed caliper setup you like.

Paul
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chimpvalet
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Re: Electronic Brake Via M/C

Post by chimpvalet »

Thanks but we have minimal space in this application as the rotors are inboard end of half-shafts at the transaxle in a mid-engined sportscar, near impossible even to add dedicated mini calipers for the P/B function.
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Re: Electronic Brake Via M/C

Post by chimpvalet »

Framing the discussion in more pertinent terms, is there a meaningful peril in leaving the hydraulic system lightly pressurised for the parking function? Decades ago linemen's boom trucks would enhance secure parking with a gadget called "Micro-Lock" (IIRC). This was an inline unit on the rear brake system which used a cam-lock lever with (presumably) Belleville washer spring-loading a supplemental M/C. When activated the unit applied the brakes hydraulically via the normal mechanisms.
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Re: Electronic Brake Via M/C

Post by Circlotron »

Australian Holdens from 71 to 78 had a similarly located handbrake, but after you pulled it up to set it then let it go, the handle would drop back down to its lowest position. As a result it never got in the way. Maybe you could modify your existing handle to do something like that?
chimpvalet
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Re: Electronic Brake Via M/C

Post by chimpvalet »

Thanks Circlotron, we wish to chuck the OEM slider calipers in which the P/B function is integral in any case. The later series of the car were fitted with such a handbrake lever but the rear brakes were by then altogether different and incompatible with our earlier cars.

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Re: Electronic Brake Via M/C

Post by Racer71 »

We had a shut off valve for the front caliper on our midget so we could lock rearend up but allow the fronts to spin while they were push starting us. We did this to prevent chattering the rearend until they got us moving fast enough, driver just had to remember to turn valve back after they fired off. Maybe a shut off to the rears that you could push the pedal and turn so the brakes would stay on. Turn valve when you’re ready to go.
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Re: Electronic Brake Via M/C

Post by chimpvalet »

One final bump on this today, to shake out any views contrary to building this. Absent that, I'm going forward with confidence that using the hydraulic system is a sound approach.

Cheers
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