Brake Fluid Flush

[DriVer]

Originally Posted by Full-Timers

. All the responses except one said theirs had no slit. I would be interested to see if any other Workhorse owners have this slit. Maybe yours is broked. Maybe Jon from Redlands can chime in. I am sure he has seen many of them.

FT,

per Bosch ...
The diagnostic if the brakes self apply is to clean the vent passages in the reservoir cap. This would be due to: Constricted master cylinder reservoir vent.

Bosch Hydro-Max Manual

Look it up in the diagnostics.

I would not blame you for not wanting to open your master cylinder for the heck of it however that said, curiousity having peaked your interest, I would find a parts store that had the master cylinder cap and rule out if there is or not a vent. Oemy said that the cap is an available part OTC.

That would be Mike at Redlands or Jon at Brazels.

[dieselclacker]

I would be interested in hearing an explanation of how the brake master cylinder would function, in its present design, without being vented. Anyone? Also, on the same subject, not removing the cap of the master cylinder for fear of somehow contaminating the fluid with moisture from the atmosphere is pure nonsense. How else are you to add fluid? Caution should be used however, not to allow solid contaminents (dirt,grime, etc) to enter the reservoir. For this reason cleaning area around the cap, and the cap itself should be done before opening.

Dieselclacker

[Oemtech]

The one I am looking at was bought at Autozone.... I use to work at Autozone and most of the folks working there don't know a thing about how things work... They just pinch in the info and sell you the part.

I will check my MC... tomorrow and report back.

[Oemtech]

Originally Posted by dieselclacker

I would be interested in hearing an explanation of how the brake master cylinder would function, in its present design, without being vented. Anyone?

Dieselclacker

Especially with the big old ABS Controller being part of the mix.

[edgray]

Originally Posted by Full-Timers

Sorry guys but I am still not seeing it......... My engineering background says this is wrong. You really got me curious but I an not going to open my system to check it out.

FT: I really admire your spunk

In spite of seemingly overwhelming evidence from at least three other members who each have some degree of expertise in the matter, you stick to your guns.!!! As the kids would say......"You ROCK" !

Seems to me this whole thing revolves around the difference in the definition of closed VS. sealed,........... Ed

[mfire1339]

Ok took my caps off this am. The slit is normally closed until the bellows can no longer extend, then open to balance pressure above and below bellows. I would call it a closed system. But does open when necessary.

Mike

[dieselclacker]

Originally Posted by mfire1339

Ok took my caps off this am. The slit is normally closed until the bellows can no longer extend, then open to balance pressure above and below bellows. I would call it a closed system. But does open when necessary.

Mike

I believe the vent works both ways, allowing atmospheric pressure in, and any pressure generated from within the system to vent out.

Dieselclacker

[DriVer]

Originally Posted by dieselclacker

I believe the vent works both ways, allowing atmospheric pressure in, and any pressure generated from within the system to vent out.

dieselclacker, This is also the theorem supporting the flux capacitor where molecules are observed transitioning freely and bi-directionally through time and space.

Just in case it came up!

[dieselclacker]

Originally Posted by DriVer

dieselclacker, This is also the theorem supporting the flux capacitor where molecules are observed transitioning freely and bi-directionally through time and space.

Just in case it came up!

Agreed, sounds perfectly logical to me,

Dieselclacker

[Full-Timers]

Well I thoroughly enjoyed this thread. I admire everyone who participated in the fact that you were all respectful of others opinions. That is one reason why I am proud to be a member of the Workhorse Custom Chassis Motorhome Forum.

I must admit that I read a while back that moisture will in fact penetrate the rubber hoses and seals and contaminate the brake fluid. It only takes 3% moisture to lower the boiling point of brake fluid to a dangerous level. So moisture will infiltrate the brake system even though it is never opened. I did more research on the slit in the cap seal and found more info including a paten on the slit. This is to allow air to pass through and not brake fluid. Without going into detail the air passage is needed more in ABS systems because of the vacuum created during ABS operation. I also found that virtually all vehicle manufactures recommend flushing your brake system with new fluid every 2 to 3 years EXCEPT GM. GM doesn’t even mention it. I think we all got a good education out of this and I have always said, “A day is lost unless you learned something”.

In closing I would like to apologize to DriVer for hijacking his original post;

Originally Posted by DriVer

Now that most of us have new calipers and brake components and the Brake Recall is fading into history like the space shuttle, lets not repeat the omissions of the past and not consider the fact that our brake fluid requires periodic flushing.

So git-er-done.

No worries; I'll be back next year with the same reminder.

[CoastieSCPO]

Originally Posted by DriVer

dieselclacker, This is also the theorem supporting the flux capacitor where molecules are observed transitioning freely and bi-directionally through time and space.

Just in case it came up!

Well now, I'm going to go "Back To The Future" and check out the flux capacitor and see if I can get the Doc to explain this theorem of molecules transitioning through time and space.

Just in case it comes up!

Bob

[DriVer]

Originally Posted by CoastieSCPO

Just in case it comes up!

Bob, Humor is a good thing.

[Easyrider]

I bought a set of speedbleeders from Oemy before the recall. I had the recall work done in early July and will be on vacation next week so I am thinking it might be a good time to install the bleeders. Just wondering about it now- will my bleeders that were made for the original calipers still fit the new calipers?

[Oemtech]

Originally Posted by Easyrider

I bought a set of speedbleeders from Oemy before the recall. I had the recall work done in early July and will be on vacation next week so I am thinking it might be a good time to install the bleeders. Just wondering about it now- will my bleeders that were made for the original calipers still fit the new calipers?

Yes sir.....