| [GMCnet] Ford A426C Vacuum Pump Issues [message #328957] |
Thu, 08 February 2018 16:14  |
powwerjon
Messages: 849
Registered: March 2013
Karma: -2
|
Senior Member |
|
|
Larry,
It looks that you have mounted the pump in a location that allow the water
and road spray to drip onto the vacuum pump from the top of the door seam.
when I installed the vacuum pump in our first using a GM pump that everyone
was using at the time (no longer available) I put it in the location that
everyone was using at the time. I noticed after the first trip that water
had dripping on the pump. I put a drip shield over the pump to protect it
from it getting wet in the future and that pump was still working without
issue in 2011 (11 years) when we sold the coach.
First vacuum pump I used in 2000:
http://www.gmcmhphotos.com/photos/vacuum-pump-vacuum-switch/p1606.html
http://www.gmcmhphotos.com/photos/vacuum-pump-vacuum-switch/p1605.html
http://www.gmcmhphotos.com/photos/vacuum-pump-vacuum-switch/p1604.html
When we bought the stretch coach in 2011 it did not have a additional
vacuum pump other than a additional small vacuum tank. The Ford pump was
mounted (in 2013) as far back in the cavity as I could. It is an area that
stays dry and the picture is little misleading as it sits up high and
doesn’t get wet, While we are in Tucson the coach is in storage here in
the RV park and I will walk over and see if I can get any additional shots
that show the small vacuum tank and pump layout.
Ford A426C pump installed in the Buskirk stretch:
http://www.gmcmhphotos.com/photos/general-pictures/p59295-dl-brake-layout.html
Water has always been a problem as it comes off the windshield and leaks
into the compartment thru the door seam. A lot of GMC’ers have installed
water drip shields to direct the water away from the vacuum pump, master
cylinder and other under the cover items.
J.R. Wright
GMC GreatLakerTech Editor
78 Buskirk 30' Stretch
75 Avion Under Reconstruction
Michigan (On Location in Tucson)
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
|
|
|
|
|
|
|
|
|
|
| Re: [GMCnet] Ford A426C Vacuum Pump Issues [message #328969 is a reply to message #328967] |
Fri, 09 February 2018 03:24  |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
|
Senior Member |
|
|
You just think the brakes work without vacuum. Try it someday. Just make sure when you do the test that you have room to coast to a stop after pressing on the brake pedal and that it is perfectly flat so you do not roll backwards after stopping. I'm glad my emergency / parking brake worked.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
|
|
|
|
| Re: [GMCnet] Ford A426C vacuum pump issues [message #328971 is a reply to message #328968] |
Fri, 09 February 2018 06:27 |
C Boyd
Messages: 2629
Registered: April 2006
Karma: 18
|
Senior Member |
|
|
Bob, I went with Mark K to pick up his new 73 coach in Pall Mall, Tenn. (home of Alvin York). Pall Mall is in a valley where access road is straight up narrow 2 lane switchback steep mountain road with drop offs and no guard rails. Mark wanted me to drive and he spent a lot of time talking to PO about the coach so it was almost dark before we got started back with Mark following in the truck. The coach had sat unused for a while and the brakes were marginal. I got about half way up the mountain and the points closed up and engine died and was immediately rolling backwards. Everything I had was on the brakes including e-brake pulled and no signs of stopping. I got it manovered backwards around the hairpin curve I was in and into a very small wide spot that had some large rocks that had fallen from the cliff and got it crammed in park against a big rock. Mark had flashers on blocking traffic and ran up to coach to tell me what a great job I had done. He found a Snow White figure sitting at the wheel with fingers gripping a bent steering wheel. I did get the points reset and drove on home carefully with no more issues.
BobDunahugh wrote on Fri, 09 February 2018 01:46 This is an area that I'm not up on. You want one of these types of pumps so that if your engine stops running suddenly while driving along. You'll still have power brakes working. I had this happen while driving someone's GMC. And this happening wasn't a surprise at that time. And there still was enough vacuum reserve in the booster. Stopped fine. Don't think a second stop would have had full boost. But the brakes still work without vacuum. Just has a very hard pedal. I'm a safety, and maintenance nut. OK. What am I missing here? Bob Dunahugh
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
C. Boyd
76 Crestmont
East Tennessee
|
|
|
|
| Re: [GMCnet] Ford A426C Vacuum Pump Issues [message #328977 is a reply to message #328957] |
Fri, 09 February 2018 08:19 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
|
Senior Member |
|
|
I was pulling Culowee Mountain when my 23' died - with the toad on back. I did manage to get it stopped before it went over the side, and the following week fitted it with a vacuum reservoir and pump. I've one more foot than Chuck to stomp with, which probably made the difference. Bottom line is, you do not want to give out of brake boost on a hill in your coach. It's usually luck which keeps you from bending something.
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
|
|
|
|
| Re: [GMCnet] Ford A426C vacuum pump issues [message #328984 is a reply to message #328968] |
Fri, 09 February 2018 11:27 |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
Karma: 11
|
Senior Member |
|
|
Thanks for the input to all. I do have a pump on hand that I haven't installed. Maybe later. I'm going to install a additional vacuum tank across under the radiator for now. You make a tank out of a 4" by 30" PVC pipe. Then put that tank in series from the engine to the booster. Nothing to quit, or break down. Thank Ken H. Bob Dunahugh 78 Royale
________________________________
From: Bob Dunahugh
Sent: Friday, February 9, 2018 12:46 AM
To: gmclist@list.gmcnet.org
Subject: RE: Ford A426C vacuum pump issues
This is an area that I'm not up on. You want one of these types of pumps so that if your engine stops running suddenly while driving along. You'll still have power brakes working. I had this happen while driving someone's GMC. And this happening wasn't a surprise at that time. And there still was enough vacuum reserve in the booster. Stopped fine. Don't think a second stop would have had full boost. But the brakes still work without vacuum. Just has a very hard pedal. I'm a safety, and maintenance nut. OK. What am I missing here? Bob Dunahugh
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
|
|
|
|
GMCforum
Search
Help
Register
Login
Home
