Dot 5 to Dot 4
Seasoned HDF Member
Joined: Apr 2011
Posts: 6,183
Likes: 2,131
From: W. Texas
So basically I blew out the master cylinder, new brake line, and bled the system using an entire container of Dot 4. I've checked the master cylinder as well as bled some off through the bleeder Ina tube and no signs of geling up or residue. Brake lever is tighter than ever before so we will see.
If time permits one thing I myself have done is to flush the system with denatured alcohol. Did this when Dot 5 was added to a Dot 3/4 system on some customers vehicles and a couple of bikes metric bikes in the past.
If there were problems latter on I haven't heard about it.
WP
Stage II
Joined: Apr 2022
Posts: 2
Likes: 0
From: Alberta
You may well ask! Whoever came up with that in DOT should be shot!
DOT3, DOT4 and DOT5.1 are all related and compatible, they are simply successive specs for polyethylene glycol-based brake fluids. Wiki can probably explain each in greater detail. DOT5 is a silicone-based brake fluid, which unlike the other three is not water-absorbing, hence it's attraction. Unfortunately it cannot cope so well with the mechanical action of current ABS systems, hence they have resorted to DOT4.
DOT3, DOT4 and DOT5.1 are all related and compatible, they are simply successive specs for polyethylene glycol-based brake fluids. Wiki can probably explain each in greater detail. DOT5 is a silicone-based brake fluid, which unlike the other three is not water-absorbing, hence it's attraction. Unfortunately it cannot cope so well with the mechanical action of current ABS systems, hence they have resorted to DOT4.
Seasoned HDF Member
Joined: May 2008
Posts: 21,034
Likes: 12,562
From: South Carolina
But it is a long dead thread anyway.
Thread
Thread Starter
Forum
Replies
Last Post
