Rear Brake Line Block Question

[Bob B.]

Hi all,

I am trying to connect the rear brake line hose to the rear brake line block. When the hose is screwed in all the way and seated, there is probably an eighth of an inch of threads left. The threads on the hose are the same as originals I have, so I'm guessing that the female part of the rear brake line block is too short but, if so, it'd be too short on a lot of cars other than mine.

Should I look for a block somewhere with a longer female threaded section, use 3-4 more of the copper washers or what?

Any suggestions?

Thanks,

Bob

[John F.]

Re: Rear Brake Line Block Question

Bob, there is a bracket welded to the rear axle housing where the block is held by a "U" shaped clip. After you screw the rubber line into the block, you wedge the clip between the bracket and the collar of the hose line. AIM for 62s show it in Section 5, Sheet 5 has a diagram. The only picture I have is from the fron of the housing. Hope it helps.

[Bruce B.]

Re: Rear Brake Line Block Question

Bob,
The flex line seats in the brake block when it is screwed in.
The threads hold it in place but do not form the seal, so if it is tight it is screwed in enough, no washers needed.

[Richard M.]

Re: Rear Brake Line Block Question

The male end of the hose is a flared fitting and mates with the inverted flare of the brass block. I'm unsure if originals used a copper washer or not, but the most recent C1's I've done using replacement hoses don't use a copper washer at the rear block. The flared union maintains the seal.

Pic from a recent '59 show several threads exposed after assembly of the hose. When brakes were completed and bled that fitting was leak-free.

Other pic a closeup of a modern replacement hose showing the flared end.

The hoses for the 2 front brakes require the copper washer, as the wheel cylinder does not have the inverted flare. It has a flat machined surface for the copper washer to seal against the flat surface on the backside of the nut on the fitting.

Rich

edit.....Bruce got it right while I was typing and looking for pictures!

[Dick W.]

Re: Rear Brake Line Block Question


Here is an illustration of the inverted flare

[Bruce B.]

Re: Rear Brake Line Block Question

The male end of the hose is a flared fitting and mates with the inverted flare of the brass block. I'm unsure if originals used a copper washer or not, but the most recent C1's I've done using replacement hoses don't use a copper washer at the rear block. The flared union maintains the seal.

Pic from a recent '59 show several threads exposed after assembly of the hose. When brakes were completed and bled that fitting was leak-free.

Other pic a closeup of a modern replacement hose showing the flared end.

The hoses for the 2 front brakes require the copper washer, as the wheel cylinder does not have the inverted flare. It has a flat machined surface for the copper washer to seal against the flat surface on the backside of the nut on the fitting.

Rich

edit.....Bruce got it right while I was typing and looking for pictures!

Rich,
Thanks for providing the correct terminology.
Bruce B

[Bob B.]

Re: Rear Brake Line Block Question

Hi all,

Thanks for the responses! The flare maintaining the seal with no copper washer and the 1/8" space with threads showing is exactly how it is on my '60 and that has worked since 2007 for 15K+ miles. However, I can't believe that was the original intent. The fitting is the same as into the two wheel cylinders. The flare seats about a copper washer thickness away from the base of the hose fitting seating and the flare keeps the seal, but the washer keeps the hose fitting from loosening.

I'll have my '57 race car chassis at Hampton, so hope to see everyone there!

Bob

[Dick W.]

Re: Rear Brake Line Block Question

Hi all,

Thanks for the responses! The flare maintaining the seal with no copper washer and the 1/8" space with threads showing is exactly how it is on my '60 and that has worked since 2007 for 15K+ miles. However, I can't believe that was the original intent. The fitting is the same as into the two wheel cylinders. The flare seats about a copper washer thickness away from the base of the hose fitting seating and the flare keeps the seal, but the washer keeps the hose fitting from loosening.

I'll have my '57 race car chassis at Hampton, so hope to see everyone there!

Bob

That design has been used for at least 75 years Bob

[Gary C.]

Re: Rear Brake Line Block Question

Bob,

Recommend you use EZ Turn Lube on all the brake line and oil line fittings including the master cylinder large nut.

http://www.aircraftspruce.com/catalog/cspages/ezturnlube.php

Gary
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