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Lotus Europa Forums => Garage => Topic started by: buzzer on Wednesday,September 07, 2022, 03:53:55 AM

Title: brake lines thread size
Post by: buzzer on Wednesday,September 07, 2022, 03:53:55 AM
I have to replace my brake light switch and struggling to find what the thread size is to make sure I get the right replacement. It connects to a union block near the engine. Any idea what the thread  is.

Dave
Title: Re: brake lines thread size
Post by: 4129R on Wednesday,September 07, 2022, 04:27:22 AM
It connects to a standard 3 way brass brake pipe union, so it is the same thread as the brake pipe male union.

I think that is 5/16" UNF.
Title: Re: brake lines thread size
Post by: buzzer on Wednesday,September 07, 2022, 04:50:05 AM
Yes its the same thread on that union and thanks.

Dave
Title: Re: brake lines thread size
Post by: dakazman on Wednesday,September 07, 2022, 03:40:58 PM
  Here is a list of other s2 fittings
http://www.lotus-europa.com/manuals/misc/brakes/S2_Order2.html

Dakazman
Title: Re: brake lines thread size
Post by: jbcollier on Wednesday,September 07, 2022, 04:06:01 PM
The thread is 3/8NF.
Title: Re: brake lines thread size
Post by: dakazman on Thursday,September 08, 2022, 05:11:55 AM
Quote from: jbcollier on Wednesday,September 07, 2022, 04:06:01 PM
The thread is 3/8NF.
   
   JB,
Are the S1 and TC’s the same thread size? I know there are differences in the system layout.

   Dakazman
Title: Re: brake lines thread size
Post by: 4129R on Thursday,September 08, 2022, 05:28:17 AM
I have just tested the 3 way brass union off a TCS and it is definitely 3/8" UNF, the same as all the brake pipe unions on a TCS.
Title: Re: brake lines thread size
Post by: jbcollier on Thursday,September 08, 2022, 07:08:14 AM
Sorry D-man, can’t answer that question definitely.  The most common brake fittings are 3/8NF until the switch to metric.
Title: Re: brake lines thread size
Post by: BDA on Thursday,September 08, 2022, 07:17:58 AM
I would be surprised if the S1 and TC brake fittings have different threads. Metric stuff didn’t creep into Brit cars till much later.
Title: Re: brake lines thread size
Post by: jbcollier on Thursday,September 08, 2022, 07:19:37 AM
Never expect the expected when dealing with a Lotus!

;-)
Title: Re: brake lines thread size
Post by: BDA on Thursday,September 08, 2022, 07:20:59 AM
 ;D
Title: Re: brake lines thread size
Post by: 4129R on Thursday,September 08, 2022, 08:42:18 AM
Quote from: BDA on Thursday,September 08, 2022, 07:17:58 AM
I would be surprised if the S1 and TC brake fittings have different threads. Metric stuff didn’t creep into Brit cars till much later.

Except for the Renault gearbox.

My latest car is 4688R and that does not differ in bolt types.
Title: Re: brake lines thread size
Post by: dakazman on Thursday,September 08, 2022, 09:46:33 AM
  That sums that up🥱😂
Dakazman
Title: Re: brake lines thread size
Post by: buzzer on Friday,September 09, 2022, 03:43:36 AM
Ik so 3/8 unf.  cheers guys
Title: Re: brake lines thread size
Post by: buzzer on Friday,September 09, 2022, 04:46:37 AM
Found the original part number lucas 34619B. also used on Norton Motorbikes. so managed to pick one up on Ebay