Princess Brake Calipers

dursleyman · Postby **dursleyman** » 02 Sep 2011 19:00

I have got hold of a set of vented discs and Princess calipers that came off a TR7, but I do not have those little adapter blocks that join the two pipe outlets into one. Does anyone know a source for these adapters please?

Russ

1980 TR7 DHC
Dursley
UK
[img]http://i1040.photobucket.com/albums/b410/dursleyman/TR7%20web%20picture/IMG_2796.jpg[img]

dycecooper · Postby **dycecooper** » 02 Sep 2011 19:05

The ones I took off of my car simply had a T piece as used on many cars (old Mini for sure)

http://www.ebay.co.uk/itm/Brake-pipe-un ... 3f0d716896

dursleyman · Postby **dursleyman** » 02 Sep 2011 19:17

Yes thanks for that suggestion, its my backup plan.
I would really like to find the nicely engineered little blocks I have seen on a couple of other cars.

Russ

1980 TR7 DHC
Dursley
UK

REPLIC8 · Postby **REPLIC8** » 02 Sep 2011 20:31

Do you mean like the ones in the picture below?

[img][IMG]http://i473.photobucket.com/albums/rr92/REPLIC8-2008/small_120.jpg[/img][/img]

If so i think these were part of the uprated kit using princess calipers supplied by Rimmers. Part number RB7090.
They still supply service parts for this kit, maybe worth a call to see if they have any old stock of the adaptor.

Andy
1981 UK SPEC TR8
[img][IMG]http://i473.photobucket.com/albums/rr92/REPLIC8-2008/175-1.jpg[/img][/img] [img][IMG]http://i473.photobucket.com/albums/rr92/REPLIC8-2008/pics005.jpg[/img][/img]

Beans · Postby **Beans** » 02 Sep 2011 21:03

Use a simple standard T-piece. Available from any decent brake supplier
The adaptor piece I got with my calipers (a long time ago) had the wrong non-metric thread [B)]

<center>

1980 TR7 DHC (my first car, now restored and back on the road)
1981 TR7 FHC Sprint (better known as 't Kreng)
[url="http://www.tr7beans.blogspot.com/"]My Weblog[/url]</center>

trsforever · Postby **trsforever** » 03 Sep 2011 07:05

Hi Russ
If Rimmers can't help try Demon Tweeks or Goodridge UK.

But it is possible to run just one pipe, you do need to split the caliper in half and remove both pistons from the half that mounts
to the strut and drill into the bottom of top piston bore
intersecting with the feed for the bottom piston, this will link
all 4 pistons, I have done this on two sets calipers with
no problem.

With the caliper dismantled insert a piece of 1.5mm welding wire
approx 300mm long into the outmost feed pipe hole, when all the
way in you will see it protude into the bottom piston bore
near the outside edge, this will help line up the position to
drill into the top piston bore.

You drill a 3mm hole in line with the wire, paralell to piston
bore (10mm up from bottom and 5.5mm in from side when looking
at caliper as if mounted on strut) champher, and clean
with compressed air etc when finished.

When reasembeled fit feed pipe to outer most inlet and an
extra bleed nipple to inner feed, and bleed brakes as nomal.
This drilling allows fluid to flow to both sets of pistons at
the same time eliminating the "Y" block and extra pipe, less
fittings to leak, neat and tidy etc.

Hope this helps.
Regards Scott.

bmcecosse · Postby **bmcecosse** » 03 Sep 2011 10:12

A Mini T won't do - it will be 3/8" UNF threaded. and I suspect you will be working with M10 X 1 thread.

maharg369 · Postby **maharg369** » 03 Sep 2011 16:22

Hi, I have a pair of the blocks. I bought them from Rimmers but didn't use them. you can have them for what I paid for them.
e-mail me with your T/number.
[:)]

Beans · Postby **Beans** » 03 Sep 2011 18:21

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by maharg369

... I have a pair of the blocks ... <hr height="1" noshade id="quote"></blockquote id="quote">
Check the blocks thread. BMC has it spot on the thread should be metric.
Rimmer's put UNF threaded blocks in their uprated brake kits in the past.

<center>

1980 TR7 DHC (my first car, now restored and back on the road)
1981 TR7 FHC Sprint (better known as 't Kreng)
[url="http://www.tr7beans.blogspot.com/"]My Weblog[/url]</center>

dursleyman · Postby **dursleyman** » 05 Sep 2011 10:05

I like Scott's idea of drilling the calipers but it needs a bit of thinking about and I am just off on holiday, so it will have to wait for the moment.
If I get too scared to go down that route I may take up Maharg369's offer of the Rimmers blocks he has - so long as they are metric fittings.

Next question is pedal travel. Bigger piston area means more fluid movement and more pedal travel. Will I have a problem?

Thanks for the advice everyone, watch this space for the result.

Russ

1980 TR7 DHC
Dursley
UK

TR Tony · Postby **TR Tony** » 05 Sep 2011 11:41

Russ, I have a set of AP 4 pot calipers on my FHC with the standard master cylinder, it all works really well & I don't have a problem with pedal travel. The brakes are progressive & powerful.

Just make sure you bleed the new brakes really thoroughly, it makes a difference getting every last bubble out of the system.

Tony

1981 2L FHC Cavalry Blue
1980 3.5L V8 DHC Jaguar Regency Red - sadly sold!
1977 TR8 FHC EFI Factory development car Inca Yellow

REPLIC8 · Postby **REPLIC8** » 05 Sep 2011 16:44

Russ, to compensate for the bigger front brakes you can fit 4 speed rear wheel cylinders to your rear brakes, this should help with long pedal travel.

Andy
1981 UK SPEC TR8
[img][IMG]http://i473.photobucket.com/albums/rr92/REPLIC8-2008/175-1.jpg[/img][/img] [img][IMG]http://i473.photobucket.com/albums/rr92/REPLIC8-2008/pics005.jpg[/img][/img]

dursleyman · Postby **dursleyman** » 19 Oct 2011 19:14

OK back from holidays and I am into the brake upgrade project. I have decided to go for the drilling option after reading Scott's explanation and talking to maharg369 who assured me it is not too difficult. This will mean splitting the calipers so I will also fit new seals at the same time and wondered if anyone has any advice or tips for fitting them?

Russ

1980 TR7 DHC
Dursley
UK

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