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Total brake failure
Posted by: Eido ()
Date: June 12, 2022 06:49AM

Yesterday I went on an eventful 100 mile drive in my Rampside.

In the morning I was actually thinking about how nicely the brakes were working. In the afternoon, things were different. I started hitting a lot of late red lights. I also had to avoid people driving like idiots. I started worrying about overworking the brakes.

About 2-3 miles from home, I started hearing some metal clanking from the rear of the truck. At a red light, I felt the brakes slipping a bit.

About 1-1/2 miles from home, I felt the brakes get soft.

4 block from home, I had no brakes at all. I manipulated hills and gears to get home, glide into the driveway, and stop gently at the lip of my yet uncut yard.

I shutter to think what would have happened if I lost the brakes at 4pm-h going down a hill into an intersection. Thankfully, that didn’t happen and truck/driver are spared for another day.

I haven’t looked at the brakes yet. I’m taking it easy today. Any thoughts on what might have happened? I have a new master cylinder, fresh brake lines, brakes were working great earlier. I’m assuming I melted/destroyed the shoes or springs.

What other bads can I be looking for?

Eido Walny
(Just north of) Milwaukee, WI
1964 Corvair 95 Rampside
1927 Tudor Model T

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Re: Total brake failure
Posted by: jjohnsonjo ()
Date: June 12, 2022 07:13AM

A chance the park brake got stuck or partially stuck. That can cook the rears in a hurry. That shouldn't take out all you brakes unless the front ones weren't working. MC may be adjusted too tight and not letting the fluid return. Try it again when thing cool down.

J.O.

65 Corsa Turbo Vert
79 Honda XL 500S
69 Honda CL 160 D
2010 BMW F 650 GS
2003 Bounder 36D
2013 KIA Optima SX turbo-AKA ZIPPY (wife,s car)
69 Newport Holiday Sailboat
Baja 150 dune buggy cart
Coleman HS 500 UTV
2016 KIA Sorento SXL Turbo

Bethlehem,Pa


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Re: Total brake failure
Posted by: JimBrandberg ()
Date: June 12, 2022 07:21AM

You should be able to work the brakes hard.
It's good that you had a gradual failure that you were aware of, one should be in tune with their machine.

Jim Brandberg
Isanti, MN
CorvairRepair.com



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Re: Total brake failure
Posted by: Eido ()
Date: June 12, 2022 07:51AM

Rampy has been sitting in the garage for about 15h now. I just pumped the brakes and there is no pressure at all. Pedal goes right to the floor with no resistance.

Eido Walny
(Just north of) Milwaukee, WI
1964 Corvair 95 Rampside
1927 Tudor Model T

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Re: Total brake failure
Posted by: jjohnsonjo ()
Date: June 12, 2022 08:14AM

Any fluid on the floor?? take a peak inside the MC. I've lost a line more than once, with and without a DMC, there was nothing slow about the failure.

J.O.

65 Corsa Turbo Vert
79 Honda XL 500S
69 Honda CL 160 D
2010 BMW F 650 GS
2003 Bounder 36D
2013 KIA Optima SX turbo-AKA ZIPPY (wife,s car)
69 Newport Holiday Sailboat
Baja 150 dune buggy cart
Coleman HS 500 UTV
2016 KIA Sorento SXL Turbo

Bethlehem,Pa


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Re: Total brake failure
Posted by: ihscomputers ()
Date: June 12, 2022 08:17AM

Start by looking for brake fluid leaks, especially around the rear wheel cylinders...

Dean F. Gemberling
Columbus, Georgia
Heart of Georgia Corvair Club Webmaster
Springfest Webmaster

1963 Rampside w/305 V8 - Built by Ken Arnold in 1998

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Re: Total brake failure
Posted by: JimBrandberg ()
Date: June 12, 2022 08:24AM

I'd start by removing the rear drums since you had bad noises there...

Jim Brandberg
Isanti, MN
CorvairRepair.com



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Re: Total brake failure
Posted by: jjohnsonjo ()
Date: June 12, 2022 09:03AM

I mentioned the MC, because its fast and easy. If its not down, most likely MC problem, if its low, look at hoses and connections, then pull wheels.

J.O.

65 Corsa Turbo Vert
79 Honda XL 500S
69 Honda CL 160 D
2010 BMW F 650 GS
2003 Bounder 36D
2013 KIA Optima SX turbo-AKA ZIPPY (wife,s car)
69 Newport Holiday Sailboat
Baja 150 dune buggy cart
Coleman HS 500 UTV
2016 KIA Sorento SXL Turbo

Bethlehem,Pa


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Re: Total brake failure
Posted by: wittsend ()
Date: June 12, 2022 09:17AM

What happened? From your description it sounds like something (yet to be discovered) came loose in the rear brakes. This caused the wheel cylinder piston to come out draining the system of the brake fluid.

As others have said look for leaks on the back side of the rear brakes. If you find the problem check the other side as whatever was done to the brakes on the bad side might be in a similar condition on the opposing side.

------------------------------------------------------------------------------

***'61 Lakewood, a "Freebie" in hibernation for 27 years - In the process of applying CPR.***

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Re: Total brake failure
Posted by: American Mel ()
Date: June 12, 2022 10:17AM

A wild guess here, but I would say that Witt is correct.
Most likely, one of those little Pin & Spring retainers wasn't fully seated correctly, and after several applications of the brakes it rotated enough for the pin to come undone.
The metallic noises you were hearing were probably the shoe shifting around inside the drum.
Once it had shifted enough, the piston fell out and the rest is history.

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WA. state, 1 mile south of the Canadian border, I am not at the end of the world, but you can see it from here.

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