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Bad master cylinder?

Started by vangremlin, October 26, 2025, 09:58:27 PM

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vangremlin

October 26, 2025, 09:58:27 PM
So on my 1980 2 door sedan, I'm having an issue with the brakes. 95% of the time they work fine. About once per trip, when I apply the brakes, the pedal goes lower than normal (not to the floor) and isn't as firm. If I let off the pedal and apply the brakes again, they act normal. Been doing it for awhile. I had the brakes bled, and it still does it. Does this sound like a problem with the master cylinder?  Thanks in advance.
1981 Kammback 258 - "Pepe"
1980 Coupe 258 - "Ginger
1972 Gremlin X 304
1978 Gremlin 4 cyl 121 - sold
1964 TBird 390 - sold

89 MJ

#1
October 26, 2025, 10:15:15 PM Last Edit: October 26, 2025, 10:15:43 PM by 89 MJ
Sounds like the master to me, might also be a leaky caliper or wheel cylinder.
1986 Eagle: 258, Auto, Chrysler 8.25 rear, 3.54 gears
1989 Jeep Comanche: 4.0, AX-15, 8.8 rear, 4.10 gears
1940 Chevy PU: 350, 700R4

EagleSX4_5Speed

#2
October 26, 2025, 10:35:15 PM
Defiantly do a visual check for fluid leaks at each wheel and the distribution block. If there is no sign of a leak then it is likely to be the master cylinder.
'83 Eagle SX4. 92 4.0 fuel injected, T5, NP229, '01 Dana 35 with Detroit Truetrac 3.54 gears.

'87 Jeep Comanche. Renix 4.0 liter, AX15, NP242, HP Dana 30 and factory Dana 44 rear axle.
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