Ok, makes sense. So question then, would the 30min regular highway drive prior not have created the boiling to make me lose pressure or are we thinking it's a combination of high vacuum with boiled brake fluids? On Mon, Sep 25, 2017, 9:40 PM Stuart MacMillan <stuartmacm@gmail.com> wrote: > The standard test for the booster is to depress the brake pedal and start > the engine. Pedal should drop a bit on startup. Like Dennis said, you > might have a stuck brake caliper piston. The friction could cause the fluid > to boil (or absorbed water to vaporize) which results in loss of braking. > Time to have the brakes checked. > > Stuart > > -----Original Message----- > From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf > Of Ryan Perry > Sent: Monday, September 25, 2017 5:55 PM > To: vanagon@GERRY.VANAGON.COM > Subject: Re: Stumble and Loss of Brake Pressure Heading Up a Pass > > Thanks Dennis, checked the level and was at max. I can't say how old the > brake fluid is so maybe it's time to change it? > > Is there a definitive test anyone knows for master cylinder and brake > booster? > Thanks > Ryan > > On Mon, Sep 25, 2017, 3:27 PM Dennis Haynes <d23haynes57@hotmail.com> > wrote: > > > Check master cylinder fluid level. Combination bad cylinder and brake > > booster can let engine vacuum suck the fluid out of the master. > > Next would be brakes dragging or otherwise overheated and you vapor > > locked the brakes. Problem could be compounded by the fluid being old > > and saturated with water. > > > > Dennis > > > > > > -----Original Message----- > > From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On > > Behalf Of Ryan Perry > > Sent: Monday, September 25, 2017 3:14 PM > > To: vanagon@GERRY.VANAGON.COM > > Subject: Stumble and Loss of Brake Pressure Heading Up a Pass > > > > This one is new for me, taking it to the collective brain trust! > > > > '84 Manual with a newly installed 2.2l GoWesty. Runs fine in all > > normal driving conditions. When heading up a pass for camping this > > weekend, think Western NC, couple thousand feet elevation over 4 miles > > or so. The van was under moderately heavy load in 3rd gear, RPMs on > > the high side but nothing outrageous, was holding steady in power. > > > > About 4 mins in the power hiccups slightly then continues on. I had a > > bit of a corner so tapped the brakes lightly and find no pressure. > > Really weird. Made it to the top for a short flat and found I had to > > pump brakes to get pressure. This was short lived for a single > > application. As soon as I let off back to no pressure, had to pump > > again. Then back up the next section of the cut under similar load and > > had the same stumble at about 3-4min in then carries on fine. Top of > > that cut and the end of our trip out the van is running fine, though a > > bit hot as expected, but no brakes without pumping. > > > > Parked, camped, had a great time celebrating or 4th wedding > anniversary. > > (Someday I'll show you all or vanagon wedding pics, you'll like them) > > Anyway, leave Sunday and brakes are fine, engine is fine. > > > > What do you think? Related? Coincidence? Vacuum line or booster? Fuel > > pressure or pump? > > > > Thanks for any ideas, i try to keep stopping at the top of my list of > > fixes! > > > > Ryan > > Asheville, NC > > > > |
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