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MG MGF Technical - Brake hydraulic hoses

Was reading an article just now about the overhaul of a B-17(Flying Fortress)and it mentioned that the u/c brake hydraulic hoses had to be replaced after 6 years ,their length of life.It raised the question for me as regards my '97 VVC( 47k only) as to whether vehicle brake hoses have an in-use life.Sure they are checked at each MOT for obvious defcts but what about "life" or do we just soldier on with them risking brake failure when you have to slam them on? Interesting question.
MR Blencowe

Its an interesting question i can answer!

My 97 F was doing about 30mph 2 weeks ago when the brakes suddenly gave way. The metalic pipe between the union on the rear subframe and the nearside rear wheel sprung a leak. I went from full brakes to nothing. Got to tell you its terrifying!

I'm in the process of replacing them. If you do it yourself its relatively cheap. The first pipe cost me £5. Well worth the money!

the union itself on t rear subframe is in an awkward place, and it not easy to get the old pipe out, but its worth the effort. Taken me about 2 hours total.

Garry

Garry

Materials have improved since the Flying Fortress was built BUT shelf life and fitted life still exist for aircraft pipes and car tyres.
A tyre supplier should not sell you a tyre more than 5 years after manufacture (marked on the side wall as week/year} and within the EEC, ultimate life is 10 years (albeit your MOT centre will ignore it otherwise they would have no business).
The majority of mileage on my 'F' is on continental tours so I have a 'Preventative Maintenance Programme'. All rubber hoses/pipes are replaced if disturbed after 5 years and will be replaced at 10.

Garry, It is probable that work has been done on your brakes when the caliper has been removed and not supported, allowing the pipe to take the weight and over stressing it.
Geoff F.
G. Farthing

This thread was discussed between 11/02/2008 and 16/02/2008

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