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TR250 & TR6 Brakes
Overhauling Brake Pipes
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These notes describe what I did on my car for my
personal use and are provided here for entertainment; they are not meant
to be instructions for others to do maintenance on their vehicles.
All the pipes and fittings may seem overwhelming at
first glance. On the other hand, all the pipes may look the same,
all the hoses they same, etc. --- until you find you put the right part
in the wrong place. As with most problems, a little attention to
detail reveals that there is a good reason when each part is the way it is
and the parts that all looked the same at first glance start to look different with a
little closer inspection. The parts are described in excruciating
detail below followed by pictures of the pipes on the bare frame.
Fitting Size & Threads: All the fillings
use standard machines threads. Three sizes are used as follows:
- 7/16 -24 TPI is used for the front brake pipes
from the master cylinder to the PDWA. This is done so that the pipes for the front and rear parts of the system are not mixed
up.
- 10mm - 1.0 mm pitch is used on the
front caliper input pipe and bleed nipple after CC81079.
- 3/8-24 TPI is used on all other pipes, hoses,
fittings, cylinders, calipers and bleed nipples.
| Pipe Flares: Two types of flares are
used on the pipes as shown in photo on the right. The male type (left in photo) mates with calipers, cylinders and
tees whereas the female type (right in photo) mates with
hoses and a 2-way coupling. The nuts turn freely around the pipe. The seal is
achieved when the nut forces the flare against the mating
fitting. |
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| Fitting Sex: The photo on the right shows both
male and female fittings on the pipes and the male fittings on the
hoses. The calipers, wheel cylinders, master cylinder, PDWA
and Tees all have female fillings. The hoses all have male fittings
on both ends. The pipes have a mixture of male and
female fittings as required for the specific pipe. |
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Replacement Pipes & Hoses: Several vendors sell replacement
pipes and hoses. Some are sold already bent to the correct shape
while others you bend yourself. The lines are fairly
soft and bend quite easily and are not prone to kinking. This time I
bought the pipes that attach to the calipers bent to shape and the rest
unbent. I was able to salvage the pipes between the master cylinder so
those two were not purchased new. I am very careful to make
sure the hoses are top quality. I use the standard hoses. I
understand other style hoses such as braided steel are available. I've had no
experience with other than the standard
hoses.
| Front Pipes: The sketch on the right
shows the pipes for the front brakes. The sketch came from the
TRF red TR250 catalog. There is a similar sketch in the
blue TR6 catalog. I cut the sketch in half and processed it to
illustrate the points of interest.
The table below lists the Triumph parts numbers (if there are
two Triumph numbers, first is for TR250 and second for TR6) and TRF
numbers if different. I purchased the new lines and hoses from
TRF and am happy with them. A little plug is appropriate since
I swiped their catalog graphics.
|
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| Parts for Front Brake
Lines |
| Sketch # |
Part #/TRF# |
Description (hose & pipe lengths
are tip-to-tip) |
| 1 |
148791-309730 |
Brake Pipe from master cylinder to
PDWA. About 13 1/2 inches long fitted with 7/16" 24
TPI male nuts at each end. I was able to salvage the old pipe. |
| 2 |
148815-309728 BPH14 |
Brake Pipe from PDWA to Tee fitting. 14 inches
long filled with 7/16" 24 TPI male nut at PDWA end and
3/8" 24 TPI male nut at Tee end. |
| 3 |
147636-309720
BPD22 |
Brake Pipe from Tee fitting to left brake hose.
22 inches long fitted with a 3/8" 24 TPI male nut at Tee
end and a 3/8" 24 TPI female nut at hose end. |
| 4 |
143320-GIGHP13 |
Brake Hose. 13 5/8 inches long with
3/8" 24 TPI male threads on both ends. |
| 5 |
141591-309723
BPD5 |
Brake pipe from hose to left caliper. This
is the one with imperial threads on the caliper end for commission numbers to CC81078. About 4 1/2 inches long with male 3/8 24
TPI nut on the caliper end and female 3/8 24 TPI nut on the hose
end. I purchased the 309723 which is pre-bent
because the bends are short and appeared to be
tricky. |
| 312550 |
Brake pipe from hose to left caliper. This
is the one with metric threads on the caliper end for commission numbers after CC81078. About 4 1/2 inches long with male 10
mm diameter 1mm pitch nut on caliper end and
female 3/8 24 TPI nut on the hose end. |
| 6 |
308150-309721
BPD42 |
Brake Pipe from Tee fitting to right brake hose.
42 inches long fitted with a 3/8" 24 TPI male nut at Tee
end and a 3/8" 24 TPI female nut at hose end. |
| 7 |
143320-GIGHP13 |
Brake Hose. 13 5/8 inches long with
3/8" 24 TPI male threads on both ends. |
| 8 |
141590-309722
BPD5 |
Brake pipe from hose to left caliper. This
is the one with imperial threads on the caliper end for commission numbers to CC81078. About 4 1/2 inches long with male 3/8 24
TPI nut on caliper end and female 3/8 24 TPI nut on the hose
end. I purchased the 309722 which is pre-bent
because the bends are short and appeared to be
tricky. |
| 312551 |
Brake pipe from hose to right caliper.
This is the one with metric threads on the caliper end for commission
numbers after CC81078. About 4 1/2 inches long with male 10
mm diameter 1mm pitch nut on caliper end and
female 3/8 24 TPI nut on the hose end. |
| 21 |
136908 |
Tee fitting. This brass fitting has three female
3/8 -24 TPI connections. I salvaged the old fitting, blasted it and powder coated it with
clear. |
| 22-23-24 |
HB710D-WP7
-TN3207 |
Bolt, flat washer and nyloc nut securing tee to
frame. The bolt is 1/4" - 28 TPI 11/4 inches long.
I substituted stainless steel parts here. |
| 30-31 |
516614-WN709 |
Nut and shake proof washer to secure one end each hose to each
front suspension turret and the other end to the hose bracket on the
front suspension (2 of each required for each hose). I substituted
3/8" -24 TPI stainless steel components for the standard hardwire |
| 32 |
59191 |
Clip securing right brake pipe to frame cross
member. |
| 33 |
137048 |
Clip securing right front pipe to suspension turret. This is not listed
in the TRF price book so I
assume it's not available. A similar clip is not used on the left side so it is probably no great loss if
not used here. I checked a half dozen TR6s and TR250s
and found that none had this clip. |
| Rear Pipes: The sketch on the right is for the
rear half pipes and is also from the TRF catalog. The parts
are listed below. |
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| Parts for Rear Brake
Lines |
| Sketch # |
Part #/TRF# |
Description (hose & pipe lengths
are tip-to-tip) |
| 9 |
148790-309729 |
Brake Pipe from master cylinder to
PDWA. About 15 inches long fitted with 3/8" 24
TPI male nuts at each end. I was able to salvage the old pipe. |
| 10 |
308348-309731 BPD36 |
Brake Pipe from PDWA to 2-way coupling. 36 inches
long filled with 7/16" 24 TPI male nut at PDWA end and
3/8" 24 TPI male nut at 2-way coupling end. |
| 11 |
308347-309725
BPD50 |
Brake Pipe from 2-way coupling to tee fitting.
50 inches long fitted with a 3/8" 24 TPI female nut at
the 2-way coupling end and a 3/8" 24 TPI male nut at tee end. |
| 12 |
143564-GIGHP14 |
Brake Hose for left rear between the tee and the pipe
on suspension arm. About 8 1/2 inches long with
3/8" 24 TPI male threads on both ends. My (very old) copy
of the TRF blue catalog incorrectly lists the GIGHP15 hose for the
left side. The fitting on the GIGHP14 that mates with
the tee is cut off square at the end and requires the washer listed
next to seal the connection. |
| |
107072 |
Copper washer between left rear brake hose and
tee. This is a standard 3/8" ID washer. I
obtained one from Lowe's. |
| 13 |
143523-309726
BPC18 |
Brake pipe from hose to left wheel cylinder. 18 inches long with male 3/8 24
TPI nut on wheel cylinder end and female 3/8 24 TPI nut on the hose
end. |
| 14 |
141588-309724
BPD22 |
Brake Pipe from Tee fitting to right brake hose.
22 inches long fitted with a 3/8" 24 TPI male nut at Tee
end and a 3/8" 24 TPI female nut at hose end. |
| 15 |
143565-GIGHP15 |
Brake Hose for right rear between the pipe from the
tee and the pipe on suspension arm. About 9 inches
long with 3/8" 24 TPI male threads on both ends. My (very
old) copy of the TRF blue catalog incorrectly lists the GIGHP14 hose
for the right side. |
| 16 |
143524-309727
BPC18 |
Brake pipe from hose to right wheel
cylinder. 18 inches long with male 3/8 24
TPI nut on wheel cylinder end and female 3/8 24 TPI nut on the hose
end. |
| 26 |
136908 |
Tee fitting. This brass fitting has three female
3/8 -24 TPI connections. I salvaged the old
fitting, blasted it and powder coated it with
clear. |
| 27-28-29 |
HB710D-WP7
-TN3207 |
Blot, flat washer and nyloc nut securing tee to
frame. The bolt is 1/4" - 28 TPI 1 1/4 inches long.
I substituted stainless steel parts here. |
| 30-31 |
516614-WN709 |
Nut and shake proof washer to secure one end each hose to each
rear suspension (1 of each required for each hose). An
additional nut and washer are required to secure the right hose to the
bracket on the frame. l substituted 3/8" -24 TPI stainless steel components for the standard
hardware |
| 34 |
59191 |
Culp securing rear brake pipe to frame between
PDWA and 2 -way coupling. |
| 35 |
618386 |
Clip securing the pipe to frame cross member. This is not listed
in the TRF price book so I
assume it's not available. I pulled one off a frame and
found that it was identical to the next clip. The two part
numbers are very similar. I wonder if the part number for this
one is an error. |
| 36 |
615836 |
Clip securing rear cylinder pipe to suspension arm (2
required). |
Pictures of Installed Pipes: No pictures yet because the
pipes aren't installed yet. Pictures should be here by
the spring of 2003.
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