Posted by dad2nick on Tuesday, April 13, 2004 at 8:24AM :
In Reply to: Re: DOT 3, 4, or 5? posted by John Waak on Monday, April 12, 2004 at 11:05PM :
Vintage Truck magazine had an article that advised against using synthetic (DOT 5) in trucks equipped with brake boosters. Apparently there is some concern that the fluid can get sucked past the diaphragm and reak havoc on the engine.