Dot 5 is silicone fluid, won't hurt paint so is preferred by trailer queen folks but it does have driveability issues. Dot 4 is very good, high temp fluid, and you can never go wrong with a quality Dot 3. With both Dot 3 and 4, they will absorb water from the air (humidity) and go bad. Best to buy a number of small containers for that reason rather than the large ones.
No corrosive DOT3 here, been there, done that, suffered the consequences. Nearly every Pontiac I work on has had new CNC bent lines or hand bent lines installed, & yes we run DOT 5. Besides leaking brake fluid wiping out brake booster plating & underhood detailing, Ive found over the years, the average Pontiac guy will next to NEVER flush what was at one time, fresh DOT3 fluid from their Pontiac's brake lines & replace it with fresh DOT3. Same average Pontiac guy will b!tch & moan about how bad the late '70's-early 80's rear disc calipers were, I've run several such setups with no problem. Neglect to proper fluid maintainence is what builds up corrosion & causes problems.
All new brake system including lines/Hoses on the '66 in '95 using DOT 3.
Purged the system a few years later and started using DOT 5.
NEVER any Issues and ALWAYS Driven.
IMHO the use of DOT 4 &/or 5 WILL likely end up causing issues if you don't maintain/Drive the car.
They become very problematic when idle for long periods of time which most classics do.
To each their own but DOT 5 has not been an issue.
I have a 66 2 door hardtop lemans and I called Rockauto looking for a set of wagon springs to bring the rear end up a touch. They ended up sending me a set of Moog 5399 Springs... I looked them up on the Moog site and they said they are only good for 67 and above. I've done a search on here and...
I bought a front disc brake conversion from Right Stuff and realized it wouldn't work with the old lines. The proportioning valve used to be mounted on the frame, the new one mounts it underneath the master. Bought a complete stainless line kit and tried to install everything last night. Most...
1967 Lemans. I've read almost all the threads and I don't quite get the core support bushing. I can't hardly see a bushing in there ( I see the one on top, but not on the frame). It almost looks like it's mounted metal on metal. I've done this before on my 78 TA, spun the cage nut, all that, so...
First, I want to apologize if there is an answer to my question in this thread I searched and couldn’t find one.
66 GTO, 400 with mild cam and .030” over, tri-power, and M21
Idle is reading about 850 to 900 rpm
Brake pedal goes to floor at low idle and if I bring the idle...
Does anyone have the proper installation or photos of this option?? I have a switch/light/harness. My original 64 manuals show nothing. Did it mount on the bottom of the dash or ?? Did it have a cover over the bulb as I have just a bulb mounted in a socket. This car came with the option group...