The New And Improved Unofficial R65 Forum V2

Technical Discussion => BMW Technical Q&A, Primarily R65 => Topic started by: Julio A. on June 04, 2015, 11:40:02 PM

Title: Brake Line problems
Post by: Julio A. on June 04, 2015, 11:40:02 PM

Hi Guys, I'm having a bit of a problem regarding my brake lines. I can't find any replacement with the female connector fitting like the original ones. I originally intended to use the original brass piping which is mounted on the fork and bolts directly to the caliper.

Since all the lines available required the use of banjo bolts, is it ok to bolt the brake line directly to the caliper?

Title: Re: Brake Line problems
Post by: montmil on June 05, 2015, 04:43:58 AM

Single front brake disc n' caliper?

Title: Re: Brake Line problems
Post by: Barry on June 05, 2015, 12:27:44 PM

Quote

Since all the lines available required the use of banjo bolts, is it ok to bolt the brake line directly to the caliper?

I suppose not in principle provided the brake line is routed so it flexes with the fork movement OK.

If you look at the short length of rigid pipe it seems to me it achieves two things:

It moves the flexible hose laterally away from the rotating wheel.

It ensures the end of the flexible hose is in line with the fork leg both laterally and vertically which may help minimise the stress on the hose connector as the hose flexes over every bump. In other words they thought about how the hose would flex with fork movement and positioned it appropriately.

Title: Re: Brake Line problems
Post by: Julio A. on June 07, 2015, 05:06:04 AM

Yup, single disc. I expected there would be a problem with the stress concentration at the joint if I did that. I think I'll keep looking for something with the proper connector. Just to be safe

Title: Re: Brake Line problems
Post by: Luca on June 07, 2015, 09:39:45 AM

The fitting is a "bubble flare" fitting.

On this side of the world I took one of my brake hoses into a NAPA auto parts store and they searched through a catalog until they found a hose with the right ends and a similar length.

Anyplace that makes hydraulic hoses should be able to make a hose for you, although around here they won't do it if you tell them the hose is for a road-going vehicle, as they don't want to think about dealing with the liability.

Title: Re: Brake Line problems
Post by: montmil on June 07, 2015, 06:06:53 PM

I once had intake manifold components machined and TIG welded at a local machine shop. One of the guys asked me what it was for. Told them it was for a gasoline-powered generator. Kinda truthful.

The manifold was for an aero-modified VW 1835cc engine that generated quite a lot of wind when the prop was turning.  ;)

Title: Re: Brake Line problems
Post by: Julio A. on June 08, 2015, 01:21:21 AM

What they don't know won't kill them. Haha