1961-71 Dodge Sweptline Truck Forum
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Almost ever since I've owned my 1968W200 (since 82), the clutch master cylinder has been finicky. What I mean by this, is if I drive my truck in stop and go traffic where I'm constantly shifting after awhile the clutch pedal will suck up air and get a spongy feeling. I've noticed tha
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Re: finicky hydraulic clutch master cylinder
Posted by:
JimmieD
(66.81.196.---)
Posts: 1,090
Posts: 1,090
Date: August 25, 2009 11:39AM
Well it would be nice if someone who has a mid 60's FSM would take time to look up Clutch Master Cylinder bores. There's been some incorrect info circulating for many years that clutch & brake master are identical. That's compounded by aftermarket vendors pulling one master off the market and then offering the other for both applications.
This could be a serious problem if it's the clutch master offered for both masters, which would change fluid volume per stroke to the brakes. If it's the brake master offered then it can over-pressure the clutch hydraulics. I believe the port drillings may be at different depths also, effecting at what point in stroke the master refills.
If a guy buys a truck and doesn't know what's installed then it can be years of grief simply because it has the same master for both applications, installed back when NAPA & others said they were the same. Having the correct bore specs straight from the FSM can answer the question once & for all.
Without doubt the Town Wagon & Town Panel use a different bore for clutch & brake masters, but using the same braking system & same clutch system as other Sweptline trucks. That makes me think that all Sweptlines specify a different bore between the two as well.
Edited 1 time(s). Last edit at 08/25/2009 11:42AM by JimmieD.
This could be a serious problem if it's the clutch master offered for both masters, which would change fluid volume per stroke to the brakes. If it's the brake master offered then it can over-pressure the clutch hydraulics. I believe the port drillings may be at different depths also, effecting at what point in stroke the master refills.
If a guy buys a truck and doesn't know what's installed then it can be years of grief simply because it has the same master for both applications, installed back when NAPA & others said they were the same. Having the correct bore specs straight from the FSM can answer the question once & for all.
Without doubt the Town Wagon & Town Panel use a different bore for clutch & brake masters, but using the same braking system & same clutch system as other Sweptline trucks. That makes me think that all Sweptlines specify a different bore between the two as well.
Edited 1 time(s). Last edit at 08/25/2009 11:42AM by JimmieD.
