Researching use of hydroboost brake system to replace stock vac operated power brake booster, runs off of p/s pump instead of engine vacuum. Should be possible, but I do not want to reinvent what may have been done before. If that is possible, I would like to convert the cable clutch release to mechanism to hydraulic similar to that used in right hand drive cars. Anyone have any experience or provide source of advice?

Can't comment on the hydroboost for the brakes. If you search long and hard, I seem to recall about 4 - 5 years ago, somebody had installed a hydraulic release bearing on a 140 or an 1800. The Swedespeed forum would be a good place to start the search.

You're trying to reinvent the wheel twice here. RHD 164 used the cable clutch. It's untidy as it has a long route across the engine. Cable clutch came in with the B20 cars and then the B30. Vacuum for brakes should be fine if everything is in good order. Don't know anything about "hydro boost" but diesel cars use an electric vacuum pump so that might be worth looking at if you want to experiment. As said though the original set-up works fine.

Welcome to the brickboard, MissPiggy.

Has the vacuum brake booster failed you in your 1971 Volvo 164?

There may exist rebuild kits with new valves and diaphragm. I forget 1971 164 has the ATE or the (somewhat maligned) Girling vacuum brake booster?

I though Cardone made more or less drop in vacuum booster replacement. Unsure the quality of these.

Though you may also have a rusty brake booster housing. I hope you brake fluid is clear and not black. Black brake fluid leads to seized brake calipers.

I'm unsure whether the OEM power steering pump assisting your steering would be best to assist your 164 braking. The pump and rack may be well meant for each other. Though you may have opportunity to replace aged power steering hydraulic lines as you splice in the braking hydroboost system.

Should you have a facebook account, ask here at the Volvo 164 group page also:
https://www.facebook.com/groups/12163788922/

I've seen articles on vacuum brake booster replacements.

Also, 164, so far as I know, did not offer hydraulic clutch with a unique reservoir or was slaved from the brake fluid reservoir. Use DOT 4 fluid. Use the Motive or like power pressure bleeder to flush brake fluid.

Though you need to adjust the cable free play at the throw out arm every so often. Recurring inspection of the cable attachment points so the cable does not brake. It may be useful to replace the cable inside the sheath. And the sheath can wear inside where the cable presses on it. I'll guess the mighty M410 or M400 behind the mighty B30?

I have no experience with power steering pump hydroboost for power assist braking in, well, anything.

I'm certain other brickboard members here can help you with your questions better than I ever can.

Hope that halps you.

Unemployed Technical Writer in Perpetuity


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