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Old 06-03-2016, 01:51 PM   #15
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Paul and Tam's Avatar

1988 34.5' Airstream 345
Ham Lake , Minnesota
Join Date: Aug 2005
Posts: 58
Thanks Richard. Yes, revisiting soon. I used Valvoline Synthetic DOT 3/DOT 4 for the first 4 quarts. The last 3/4 quart was Penzoil Synthetic DOT 3. Walmart was out of the Valvoline when I went back for the last quart. The DOT 3 is in the rear circuit only... which probably gets hotter than the front when everything is working properly. Hopefully they will have more Valvoline next time I visit.

Everything worked well enough getting here today. Only 90 miles. I noticed that the brakes work better as they warm up during a stop from 60 mph.

- Paul

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Old 06-03-2016, 02:12 PM   #16
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1989 34.5' Airstream 345
Hanalei, /Chino Valley , Hawaii / Arizona
Join Date: Jul 2013
Posts: 678
Glad you are out enjoying your coach.
Your discription of the brakes coming on more strongly with a bit of time on the peddle could be caused by restriction in the old flex lines. Might want to keep your nose pealed for the smell of dragging brakes after a stop. Could be slow to retract also.

Pardon me, just how my mind works when partway thru a system rebuild. Envisioning the issues that could come from the yet to be replaced parts.
It's a sickness, but motivating.

Have a fun trip.

Cheers Richard

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Old 06-06-2016, 01:19 PM   #17
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1991 25' Airstream 250
Oxford , Oxfordshire
Join Date: Jun 2007
Posts: 286
Images: 5
My old brake hoses collapsed on the inside and caused lots of issues. It's a straightforward job to bleed and replace them, also well worth it. Don't mess with brakes and batteries; that's served me well.

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Old 06-25-2016, 10:06 PM   #18
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1988 34.5' Airstream 345
Ham Lake , Minnesota
Join Date: Aug 2005
Posts: 58
Today's adventure... after weeks of soaking in penetrating oil I finally got the old flex hose off. The differential end came apart well enough, but the frame end was truly stuck. As I replaced he hose I realized that the drivers side of the connector block is the high side, which is where the bubbles go. And this is why bleeding the drivers rear first seems to be more effective. After a gravity bleed of the hose hanging from the frame I connected the brake lines on top of the differential. Gravity bleed continued. Once connected, and the master cylinder refilled, I did a one man bleed using the left rear only and all the air seems to be out of the system.

A couple of quick photos for posterity.

A test drive showed slightly lower brake pedal effort, but not the improvement I expected. I think the rest of the brake hoses will be replaced soon.

And here is the old flex hose. The date code is June 1987. What I thought was deteriorating rubber was in fact undercoating. Really. Probably should have had a little more light under there.
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