Brake experts needed
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Freshman User
Joined: Jul 2016
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From: Statesville, NC
Brake experts needed
i have a 1973 F350 SCS. Was driving fine for the first time in a year, then I had little to no brakes all of a sudden. That and I can hear a hissing sound when the pedal is depressed. Think it's the brake booster/master cylinder, but seeing if anyone else has ideas. Haven't checked anything out yet to see if I can see busted hoses or wetness at the drums yet
Postmaster
Joined: Mar 2011
Posts: 2,698
Likes: 7
From: Taxachusetts
Yeupp....vacuum lines going to the booster, the booster itself, and/or the check valve on it.
Check the vacuum lines and check valve first....if they check out ok there's other tests for the booster itself.
Hope that hissing sound isn't brake fluid leaking......
Check the vacuum lines and check valve first....if they check out ok there's other tests for the booster itself.
Hope that hissing sound isn't brake fluid leaking......
Laughing Gas
Joined: Nov 2013
Posts: 1,207
Likes: 60
From: S.E. Louisiana;so far USA
i have a 1973 F350 SCS. Was driving fine for the first time in a year, then I had little to no brakes all of a sudden. That and I can hear a hissing sound when the pedal is depressed. Think it's the brake booster/master cylinder, but seeing if anyone else has ideas. Haven't checked anything out yet to see if I can see busted hoses or wetness at the drums yet
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Freshman User
Joined: Jul 2016
Posts: 30
Likes: 0
From: Statesville, NC
Well around me a brake booster is around 100, brake booster with master cylinder is like 120, so I might as well replace both. The master cylinder on there now looks horrible
Postmaster
Joined: Mar 2011
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From: Taxachusetts
Cargo Master
Joined: Nov 2011
Posts: 3,354
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From: Great American SouthWest
When installing the new booster, make sure the rod that engages it has the proper clearance. I've not done one yet, but that seems to be the cause of many frustrations here...
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Logistics Pro
Joined: Jul 2005
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Might have to do the lines between the booster and the metering/proportioning valve, but no biggie. I bought five or six footers and cut and reflared in order to install the original line fittings. Wrapped them around an aerosol can to make some 'stress-absorbing' coils, and plumbed them in.
And in case you're not familiar, there's also the valve on the metering/proportioning valve, which needs pulled out on lighter trucks, in order to bleed the fronts. On heavier GVW trucks like an F250, that little valve gets pushed in to bleed the fronts.
And in case you're not familiar, there's also the valve on the metering/proportioning valve, which needs pulled out on lighter trucks, in order to bleed the fronts. On heavier GVW trucks like an F250, that little valve gets pushed in to bleed the fronts.
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