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#1
10-06-2023, 08:09 AM
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66 GTO brake pedal return
Noticed recently the brake lights staying on. Pedal isn't returning like it should. Eventually does after maybe 10 sec.
Brakes function normal, no pulling or dragging that I notice. Power drum brakes. 10 year old master cylinder. Suggestions? Thanks! |
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#2
10-07-2023, 07:27 AM
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Sounds like the MC to me.
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Greg Reid Palmetto, Georgia |
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#3
10-07-2023, 08:05 AM
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Thanks
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#4
10-08-2023, 12:19 AM
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Most inline brake boosters have a return spring inside, which might be broken. Not sure if your model does. Need to find an exploded view & check.
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#5
10-08-2023, 02:38 AM
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This?
__________________
1965 Pontiac GTO 455/469 w/ #48 Heads, '65 Tri-Power 9.25:1 CR Stump Puller Cam Muncie M22W 1st-2.56 2nd-1.75 3rd-1.37 4th-1.00 3.55 Rear Differential Front: 225/60R15 Height: 25.6" Rear: 275/60R15 Height: 28" |
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#6
10-08-2023, 11:42 AM
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I'm pretty sure he's referring to the spring inside the master cylinder. If you have a master cylinder in a vice to bleed it, it has a pretty strong pushback. If the pedal isn't coming back that's the first thing that enters my mind. Either the piston is rusted stuck or perhaps the spring is broken as Geoff mentioned.
Not saying that I'm right but it's the first thing I would check.
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Greg Reid Palmetto, Georgia |
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#7
10-08-2023, 04:22 PM
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try a little heavier spring on the pedal assembly first
its pretty easy to get to vs the MC one.
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Everything comes and goes Pleasure moves on too early And trouble leaves too slow |
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#8
10-08-2023, 05:03 PM
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Spring on the pedal assembly is a manual brake
only deal. If a power brake master cylinder is no longer capable of performing it's duties... Not stopping where you're supposed to is quite a disconcerting feeling |
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#9
10-08-2023, 09:34 PM
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Thanks guys. More likely the master cylinder(spring) than the booster(spring)?
Booster would be original. |
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#10
11-25-2023, 11:19 PM
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It stopped sticking...
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#11
11-26-2023, 12:20 AM
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Odd. It's probably going to stick again soon, though.
Just want to reiterate what others here have stated, which is that since your car has power assist brakes, it does not use a return spring on the pedal assembly. The spring responsible for returning the pedal is inside the master cylinder. My hunch is that the piston bore in the MC is not in great shape and is not allowing it to move freely all the time.
__________________
 1966 Pontiac GTO (restoration thread) 1998 BMW 328is (track rat) 2023 Subaru Crosstrek Limited (daily) View my photos: Caught in the Wild |
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#12
11-26-2023, 01:12 AM
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Nope, the pedal return spring on power brake cars is inside the booster, not inside the m/cyl.
Good pic of it Zazarine's resto book, p. 219 |
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