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Veteran
Posts: 201
Location: Fremantle, Western Australia, Australia | Hi everyone, I have just finish converting my 1958 Plymouth Belvedere RHD (with 1958 Dodge RHD dash) to Power Brakes,
the car has the Kelsey-Hayes power braking system. The whole braking system has been rebuilt with new rubbers, seal
and hoses. Drum brakes have been machined, new wheel cylinders and rubbers and new shoes...so the works.
The car brakes beautifully, the best I have ever had them since owning the car (1985), the problem is when its been
driving for around 20-30 mins the pedal becomes hard, you just have to touch the pedal and the car comes to an
immediate stop. If I pull the hose from the vacuum reservoir, blast of air comes out, and the braking system returns
to normal and if you keep driving again for about 20-30 mins same thing happens again
Does anyone know what the problem could be
cheers
Roberto
Edited by roblun 2014-04-23 3:11 AM
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Attachments ---------------- $T2eC16J,!)UE9s3wBoDoBS!HU!MH)w~~60_57.JPG (175KB - 121 downloads)
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Expert
Posts: 1737
Location: Hay Lakes, Alberta, Canada | Hi Roberto,
I'm no expert on these boosters, but seems to me that the booster may be trying to operate, when you are not needing it...the shop manual lists several important adjustments that need to be checked, such as pedal free play, and pedal trigger adjustment. Have you set those after your installation? I could copy the manual, if you don't have one... |
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Veteran
Posts: 201
Location: Fremantle, Western Australia, Australia | Hi Brad I have the 1958 Plymouth manual, is this the manual that you
are talking about, Cheers |
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Location: Under the X in Texas | I'd suggest you talk to Karp's Brakes in Ontario, CA who is an expert on the K-H system. If not a call, try email. They are currently sleeving wheel cylinders for me. |
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Expert
Posts: 4043
Location: Connecticut | I'm willing to bet that the power brake trigger arm needs adjustment. See page 44 of the 58 Ply shop manual. Just a silly question: When you changed over to power brakes, did you also install a power brake pedal assembly ? Ron |
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Expert
Posts: 3575
Location: Netherlands | Usually this sympton means there is not enough play in the shaft between the master cylinder and brake pedal.
When things warm up the MC starts to get actuated and prevents brakefluid returning from the sytem.
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Expert
Posts: 3400
Location: Chestertown, NY ( near Lake George) | Booster control valve could be the culprit also. |
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Veteran
Posts: 201
Location: Fremantle, Western Australia, Australia | Hi Ron, yes the Power Brake Pedal Assembly was installed...Cheers |
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Veteran
Posts: 201
Location: Fremantle, Western Australia, Australia | Hi all still having problems with these darn brakes |
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Expert 5K+
Posts: 8947
Location: WHEELING,WV.>>>HOME OF WWVA | open up the bellows and "make sure" everything is real clean and "everything" moves freely --------------------------------------------------------later |
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Expert
Posts: 3778
Location: NorCal |
roblun - 2014-07-23 3:59 AM
Hi all still having problems with these darn brakes
What have you done so far? Adjusted the push rod? Adjusted the actuator arm as per the FSM? |
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Expert
Posts: 3575
Location: Netherlands | I've delt with the actuator arm once some years ago I recall that it should be adjusted properly.
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Veteran
Posts: 201
Location: Fremantle, Western Australia, Australia | OK, there just seems to be a small problem now, when driving the car on an open road/freeway at normal
speed the car is braking beautifully no noises or locking , once I start to drive in the city where there is a lot of slow speed
driving and starting and stopping that's when the problems start. When moving from a Stop position or start to slow down
the Brakes will start grabbing, and you can hear clunking and thudding on the front passenger side and then the noise stops
after I get to cruising speed.
The other problem is, and its happened a few times, I would be driving probably at 5- 10 mph, just touch the pedal
and the car would lockup on the driver's side and pull slightly to the right hand side and screech to a stop. Once I get back
driving on an open freeway at 50-60 mph it breaks beautifully again, its just goes crazy when I'm driving slowly and using
the brakes more in city driving
My car is Right Hand Drive
i |
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Extreme Veteran
Posts: 594
Location: Melbourne, Australia | After checking for shoe contamination, I would check/replace the return springs on the shoes.... often overlooked. I had an identical problem to you Roberto ! The fronts at the very least.... Colin |
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