danny51
Lead Driver
Joined: Apr 2011
Posts: 6,399
Likes: 40
From: El Dorado, Arkansas
RPVs were originally installed in the MC ports that supplied pressure to the drum brake circuit(s). An RPV would not have been jnstalled in a MC port that supplied pressure to a disc brake circuit.
If your MC is a parts store replacement, there's a really good chance it will not have an RPV in the secondary port, even if the OEM MC did.
Diagram of a manual drum/drum MC.
But, the factory disc/drum brake valve for your truck will have a metering (hold-off) valve in the disc brake circuit.
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 787
From: Simi Valley, CA
No F150's until 1975.
have a residual pressure valve built into it to keep some pressure on the front calipers?
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