Swapping proportioning valve for "T" fitting... Options

[Wanna9146]

I read on this forum recently about someone swapping out their proportioning valve for a "T" fitting.

Does anyone know the size/thread count of the correct "T" fitting? Any fabrication required?

[ClayPerrine]

I read on this forum recently about someone swapping out their proportioning valve for a "T" fitting.

Does anyone know the size/thread count of the correct "T" fitting? Any fabrication required?

No fabrication required, but you will have to move one of the brake lines to get it to reach.

The T fitting is used on early 911s. It is a bubble flare T fitting, and you should be able to get one from any of the Porsche parts places.

[smg914]

You can also purchase the same "T" fitting at your local VW parts and accessories store for about half the price of the Porsche dealer. The last time I purchased one at a VW store I paid $7.00 for it.

[Krieger]

You can also purchase the same "T" fitting at your local VW parts and accessories store for about half the price of the Porsche dealer. The last time I purchased one at a VW store I paid $7.00 for it.

(IMG:style_emoticons/default/agree.gif)
I upgraded front brakes to BWM calipers and did this mod about 6 years ago. The originak reg is still in a zip lock.

[Wanna9146]

Would it be P/N 914.355.667.00 ?

[Wanna9146]

I upgraded front brakes to BWM calipers and did this mod about 6 years ago. The originak reg is still in a zip lock.

I don't need to do the BMW caliper conversion for this to work, right?

[904svo]

Where at in Ga. do you live? I have a spare T you can have, it came out of a
1973 914. I live in Woodstock, Ga.

[r_towle]

I upgraded front brakes to BWM calipers and did this mod about 6 years ago. The originak reg is still in a zip lock.

I don't need to do the BMW caliper conversion for this to work, right?

Well, in reality yes.

In any car you want a bias towards the front brakes for safety.
When you stand hard on the brakes, a considerable amount of weight is transfered to the front of the car.
This has the affect of raising the rear of the car.
70% of your braking should be done by the front brakes and that is how the stock proportioning valve is setup to work.
Its how all cars are setup and its why you wear out front brakes alot faster than rear brakes.
If you put larger brakes up front, you can create the same affect and thus you can use the t-fitting.

Currently our brakes are not designed this way, so the proportioning valve delivers more pressure to the front brakes and creates the 70-30 split.

There is a very good chance that in an emergency braking situation you will loose control of the rear of the car if you have stock brakes and no proportioning valve.
These cars spin like tops once the rear lets loose, and with such low HP, there is little chance to power your way back straight again.

The stock system is designed very well, and the Proportioning valve is a simple piston/spring that has few moving parts.
They are tough to learn how to bleed through, but once you learn that, its a simple system. The t-fitting makes bleeding the brakes alot easier, but in relaity, how often do you really bleed your brakes??

Rich

[brant]

have fun spinning off the road backwards into the ditch/tree/parked car/etc.

[Wanna9146]

Where at in Ga. do you live? I have a spare T you can have, it came out of a
1973 914. I live in Woodstock, Ga.

I'm in FLA. Where on the car did you find the "T"? I have a '71 body that I'm using for parts.

[Wanna9146]

The stock system is designed very well, and the Proportioning valve is a simple piston/spring that has few moving parts.
They are tough to learn how to bleed through, but once you learn that, its a simple system. The t-fitting makes bleeding the brakes alot easier, but in relaity, how often do you really bleed your brakes??

Rich

That's the problem I'm having now. I'm planning ahead in anticipation of the proportioning valve being DOA. The car has been sitting for 15 yrs.

[Wanna9146]

have fun spinning off the road backwards into the ditch/tree/parked car/etc.

Cool! I look forward to it. Especially as I always race to the corner store for milk and cruise the beach @ 15mph... I can't even get the rear tires to break loose. Knowing that adding this "T" is going to get my car to spin-out is excellent. Does it really make the top speed/HP better? (IMG:style_emoticons/default/beer.gif)

[rhodyguy]

i've never quite understood the reasoning for ditching the valve. for a stockish car with stock brakes why jump thru the hoops?

[Wanna9146]

i've never quite understood the reasoning for ditching the valve. for a stockish car with stock brakes why jump thru the hoops?

How much is a new (rebuilt) proportioning valve? ($275.25)

How much is a "T fitting...?

[rhodyguy]

ok. what do you figure a known good used valve costs? report back with the improvements the T provides. anticipation? more like assuming. you're prob correct...while replacing all 4 rotors, 4 calipers, 4 corners woth of pads, master cly, and soft lines, the T is a good idea. anticipate everything is garbage and melt down the visa card. don't forget new front bearings and seals too. contact eric shea. he can provide you with everything you'll need.

[Wanna9146]

ok. what do you figure a known good used valve costs? report back with the improvements the T provides. anticipation? more like assuming.

"Known good used" - I don't do this anymore. Burned too many times by sellers saying "works perfect!"(Eric Shea now has 3 "rebuilt" brake calipers of mine that the sellers all promised were "excellent"). Almost always BS when it comes to moving parts. The only used parts I buy are body parts, etc.

Everything else on the system is new. Still have a mushy pedal. What's left? Once I discover the proportioning valve is the problem, I have the "T", throw it in and I'm on the road again. Or, I bang my head against the wall, ask a million questions here about brake bleeding, THEN find out it's the proportioning valve. Wait another week for it to arrive. So...in THREE weeks I'll be on the road instead of tomorrow.

OK.

[904svo]

Where at in Ga. do you live? I have a spare T you can have, it came out of a
1973 914. I live in Woodstock, Ga.

I'm in FLA. Where on the car did you find the "T"? I have a '71 body that I'm using for parts.

This T fitting was located in the front brake circuit, from the master cylinder.
it was used to split the left and
right brake lines

[rhodyguy]

happy motoring.

k

[Wanna9146]

This T fitting was located in the front brake circuit, from the master cylinder.
it was used to split the left and
right brake lines

Cool. I'll "borrow" that one to see if it fixes my current problem.

[Wanna9146]

happy motoring.

k

If I do this swap, I'll post a video of my car hard-braking from 50 mph (top speed for me...I don't drive on the freeway and there are no canyons in FLA).

Anyone taking bets that the car won't stop in a straight line?

(IMG:style_emoticons/default/beerchug.gif)