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Brake Problem - 57 Fuelie Bonneville Convertible

 
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jlau



Joined: 23 Jun 2016
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PostPosted: Tue Jul 26, 2016 10:08 am    Post subject: Brake Problem - 57 Fuelie Bonneville Convertible Reply with quote

Does anyone know how many inch/pounds of vacuum goes to the brake booster? Also, does anyone have any pictures of how the vacuum hose is routed from the engine to the brake booster. The brakes very slowly stop the car, but they do not grab at all.

Thanks for any info on this.
John

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Larry
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PostPosted: Wed Jul 27, 2016 10:07 am    Post subject: Brake Problems Reply with quote

I cannot find any info in the '57 Shop Manual about amount of vacuum. However, it has always been my experience that the maximum amount of vacuum able to be produced is what goes to the brakes. You will also have a canister to "store" vacuum so it is always available in the maximum amount.

I cannot find info on the fuelie setup, but am sure it is like the carb cars in that the vacuum line to the brakes will be a large line coming from a large outlet. I also do not find any routing info.

There is a test you can do that will help zero in on the problem.. see the scan attached here.

I am guessing from what you describe that you are experiencing an internal "hang up" in the vacuum operation of the power brake unit. Or, if that is fine, the actual master cylinder could be hanging up internally.

Start with the simple stuff, looking for vacuum leaks, etc. If this car is not used a lot, it may be an internal issue (vacuum and/or hydraulic) that will require digging inside to solve.

Just a thought.... run the car, and after it has sat for a couple/few hours, pull a vacuum line at the canister and see if you hear a rush of air into it. If not, it is leaking down somewhere.

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jlau



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PostPosted: Wed Jul 27, 2016 10:39 am    Post subject: Reply with quote

Thanks, Larry! We have since discovered that the brake pads are cheap and very hard. They are also cemented to the shoes, so we have sent them off to a place that has done good brake work for us in the past. The drums are all original, so we have ordered replacements for the rear. We are still looking for front drums.
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Larry
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PostPosted: Wed Jul 27, 2016 7:04 pm    Post subject: Brake Problem Reply with quote

I guess my theory of stating with the simple stuff turned out to be even simpler than thought. Bad shoes are like no brakes at all sometimes. They just have no bite at all.

If it helps narrow your search, the Hollander Interchange Manual lists the front drums as fitting 1955-58. It does not breakdown by model, so all must be the same.

If it means anything, Hollander shows a PN524730 as 12" for 1957-58. It also shows PN519224 as 1955-56 with no indication of diameter. It appears there may be two different sizes. Check the diameter of yours.

Let us know if you find a good source of drums.

BTW, have you checked with Brake and Equipment Warehouse in Minneapolis? They have a lot of parts and services.
800-233-4053 / 612-378-3141
Website http://www.brakeplace.com

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