Lotus Elan

Rear Brake Lines Too short

PostPost by: danielmo » Mon Jul 22, 2019 4:30 am

I just rebuilt and replaced the hydraulic system on my S3 Coupe. I installed SS brake lines all around. While up in the air, I also installed a CV axle conversion (not sure if it’s relevant, but trying to give all the details). When I jacked up the body to drop the car off the jack stands, I noticed that the rear brake lines were stressed at the limit of their length. So it looks like I need to install longer hoses in the back.

Has anyone else run into this problem and does anyone know how long the hoses need to be so they are not stretched?

Thanks,
Dan
danielmo
Second Gear
Second Gear
 
Posts: 137
Joined: 05 Nov 2003

PostPost by: rgh0 » Mon Jul 22, 2019 9:30 am

I think there were at least 2 different routes of the rear brake pipes originally and many more variations have been introduced by previous owners. A photo of you're setup that is too short will help understand the potential causes. The CV joints also droop more that the donut original drive shafts and this will also add to the problem,

cheers
Rohan
User avatar
rgh0
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 7076
Joined: 22 Sep 2003
Location: Melbourne, Australia

PostPost by: Craven » Mon Jul 22, 2019 10:58 am

Original fitment to the caliper used a banjo adaptor, this increases the effective length of the hose by about 25 mm or so do you have this.
Craven
Fourth Gear
Fourth Gear
 
Posts: 856
Joined: 14 Sep 2013
Location: south coast uk

PostPost by: danielmo » Mon Jul 22, 2019 2:11 pm

Will take pictures tonight.

The SS lines have integrated banjo fittings, and the overall length is approximately 15 inches. The other end is a bulkhead fitting for the hard line to connect to.

The routing goes directly from the upper chassis mount, behind the strut and directly to the caliper.
danielmo
Second Gear
Second Gear
 
Posts: 137
Joined: 05 Nov 2003

PostPost by: 1owner69Elan » Mon Jul 22, 2019 4:38 pm

I ran into the same problem when replacing the original fabric covered brake lines with stainless steel ones on my S4. In the process of doing some work on the rear strut I left the new SS line hooked up and ended up stressing the upper fitting/hose connection to the point that when I later went to bleed the brakes there was a leak. Not sure this was caused by the line being too short but rather my mistake in letting the whole strut unit hang on the line when disassembled.

I then ordered a new set of lines from TTR. TTR supplied Earls versions that are SS but also covered. Problem then was that the rear lines were too long (not too short), so they fouled the body at the rear.

Below picture shows a length comparison of the original line (14.5" end to end), a SS line (~14.5" from Matty maybe), and the TTR suppled Earls version (17", which was too long). TTR subsequently supplied me with a rear line of the correct length (same as original).

img_0335.jpg and
img_0338-1.jpg and


So, while you feel you need a longer line than what you have, if it is too long it could foul the body. I found that using the original length, 14.5", was OK.

I also have CV's.
'69 Elan S4 SE
Street 181 BHP
Original owner
User avatar
1owner69Elan
Fourth Gear
Fourth Gear
 
Posts: 561
Joined: 16 Jun 2015
Location: California

PostPost by: danielmo » Mon Jul 22, 2019 4:47 pm

Ok, thanks for that. I'll have to re-measure and take some pictures tonight.

Thanks.
danielmo
Second Gear
Second Gear
 
Posts: 137
Joined: 05 Nov 2003

PostPost by: danielmo » Tue Jul 23, 2019 4:01 am

The overall length of the brake hose is about 13 inches. A picture of the Right rear.

This is close to ride height.

cff936c4-5319-48fb-a685-21e32b785719.jpeg and
danielmo
Second Gear
Second Gear
 
Posts: 137
Joined: 05 Nov 2003

PostPost by: wotsisname » Tue Jul 23, 2019 1:36 pm

on the +2 the flexi hose should run to the bracket on the damper mounting tube and there would be a hardline with some curvature/flex running to the caliper. I'm not familiar with the Elan to know if that is a +2 hub carrier or if it should be set up as the +2

Adrian
1968 Elan plus 2 - project
2007 Elise S2 [modified with a Hethel 70th sticker (yellow)]
2000 Elise S1 - Sold
wotsisname
Third Gear
Third Gear
 
Posts: 341
Joined: 24 Jun 2015
Location: Hertfordshire, UK

PostPost by: danielmo » Tue Jul 23, 2019 2:03 pm

That hub carrier is an Issue 18 (from a Series 4) that I updated on my Series 3 Coupe. From what I have read, the bracket on the tube is not used for the Elan.
danielmo
Second Gear
Second Gear
 
Posts: 137
Joined: 05 Nov 2003

Total Online:

Users browsing this forum: No registered users and 11 guests