Brake Fluid
Road Master
Joined: Feb 2007
Posts: 1,161
Likes: 39
From: LOST WAGES
According to the shop manual for 1970-1978, it's Dot 5 (under fluid requirements in beginning of the manual.) It was usually on the master cylinder cap as to what fluid it used. I thought they went to dot 5 when they started using disc brakes.
Seasoned HDF Member
Joined: Mar 2010
Posts: 21,117
Likes: 7,643
From: Poolville
Wow.. didn't think dot 5 back then.. Thanx. I found it on page 1-15 in the manual....
Seasoned HDF Member
Joined: Mar 2010
Posts: 21,117
Likes: 7,643
From: Poolville
If you don't have a paper copy of the FSM, I suggest you get one.... They're still available....
Road Master
Joined: Feb 2010
Posts: 1,191
Likes: 574
At the risk of hijacking this thread, I've got a'68 FLH that I'm working on the brakes. MC has been replaced by PO and says to use DOT 5. It doesn't appear to have DOT 5 in the system. After applying brake, rear wheel locks up. I've made sure bypass port in MC is clear and that adjusting rod has sufficient free play and shoes are adjusted correctly. I've got a new wheel cylinder ordered so I'll replace that next week. My question is can Dot 4 be used in the MC that says Dot 5 on the cap if Dot 4 is the only fluid used? It doesn't appear that Dot 5 was ever used. I may be overthinking this and I just have a sticky wheel cylinder but if Dot 4 messes with the internals of a Dot 5 MC, I'll either have to flush the entire system and use Dot 5 or replace MC with a Dot 4 compatible one. I've read conflicting opinions on this and thought I'd throw it out there.
Thanks in advance.
Thanks in advance.
Seasoned HDF Member
Joined: Apr 2010
Posts: 9,576
Likes: 7,953
From: Long Island, New York
Read the cap on the top of your Master Cylinder. The manual will only help you if your brake system is 100% factory and has never been changed. When I changed the master on my bike, we had to do a full flush as the new repo unit used a different fluid type then the repo unit we were replacing.
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Road Warrior
Joined: Jun 2008
Posts: 1,344
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From: Watertown, CT
Yeah , at just under $200.00 I'll live with the missing pages.
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Seasoned HDF Member
Joined: Mar 2010
Posts: 21,117
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From: Poolville
What????? where the hell did you get that..... The MOCO sells them for $60.00..... I'll bet you went to ebay and didn't bother to call your local dealer....
Last edited by 98hotrodfatboy; Feb 4, 2018 at 12:41 PM.