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09-04-2022, 09:39 AM | #61 | |
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Re: Brakes - Wives Tales & Misconceptions
Quote:
That is where the PPV comes in. As the vehicle slows, weight is transferred to the front axle and the rear axle becomes light, allowing the rear brakes to lock. When they lock, especially on a wet road surface, the rear of the vehicle may come around. Where the real problem comes is when an enthusiast will swap brake designs from different vehicle(s) onto his project. Everything is thrown off. This is where an ADJ PPV (or anti-bias valve) comes into play as the OEM PPV is not calibrated for the mix-max. It is really a guessing game unless thought out and a skid-pad is used. Even a tire size change or vehicle lowering/raising can/will change the factory PPV settings for the car. On an OEM PPV, KNEE POINT is when the applied pressure to the rear brakes begins to be restricted and the slope is the degree of further pressure restriction according to the level of the hard/panic stop. On an ADJ PPV, only KNEE-POINT is adjustable, slope is not. A HYDRO-BOOST install will generate greater brake line pressure(s) than say a vacuum booster. I am a firm believer in a dual reservoir MC as when I was young I went over an embankment in a 62 IMPALA (conv yet with the top down) after the MC decided to quit. It took months of recovery and physical therapy to rid my self of the induced trauma of sucking up two feet of seat cover. Luckily the cover material was cheap vinyl rather than cloth ...
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- AT MY AGE, ONE APPRECIATES A STURDY HANDRAIL - Last edited by KULTULZ; 09-04-2022 at 04:04 PM. |
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09-04-2022, 09:57 PM | #62 |
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Re: Brakes - Wives Tales & Misconceptions
Somewhere in my past I saw one of those “height sensing valves”. I think it was a Saab. No surprise with the front engine/drive combo with a lot of nose weight. Not to mention the aircraft engineering base of the company. This was after the 2 stroke engines IIRC.
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09-17-2022, 08:22 PM | #63 |
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Re: Brakes - Wives Tales & Misconceptions
- BENDIX TREADLE-VAC AS USED ON EARLY MERC-EDSEL-LINC - If one has an early car with TREADLE-VAC and wishes to convert it to a DIAPH VACUUM BOOSTER, you may want to read these referring URL's - https://57fordsforever.com/smf/index.php?topic=1377.0 https://www.jalopyjournal.com/forum/...stion.1271208/
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09-21-2022, 03:23 AM | #64 |
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Re: Brakes - Wives Tales & Misconceptions
- DISCUSSION of 1957/1959 MASTER CYLINDERS - - MANUAL & POWER - BORE SIZE - https://www.fordbarn.com/forum/showthread.php?t=315599
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09-23-2022, 01:36 AM | #65 |
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Re: Brakes - Wives Tales & Misconceptions
[emoji3059][emoji3059]
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09-23-2022, 07:35 AM | #66 |
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Re: Brakes - Wives Tales & Misconceptions
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...hmmpf ... Wonder which imoji I got imoji'd with ... Natives are starting to get restless again ...
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09-29-2022, 06:48 PM | #67 | |
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Re: Brakes - Wives Tales & Misconceptions
- AND IT JUST KEEPS GOING ON -
Quote:
(POSTERS NAME WITHHELD TO PROTECT THE INNOCENT)
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09-30-2022, 01:36 AM | #68 |
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Re: Brakes - Wives Tales & Misconceptions
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10-21-2022, 05:51 PM | #69 |
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Re: Brakes - Wives Tales & Misconceptions
Here is a really interesting perception on braking dynamics -
https://www.jalopyjournal.com/forum/...#post-14651920
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10-21-2022, 06:00 PM | #70 |
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Re: Brakes - Wives Tales & Misconceptions
Another In The Continuing Saga of
- 'THEMS' THE BRAKES' - - https://www.jalopyjournal.com/forum/...estio.1277085/
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11-11-2022, 04:35 AM | #71 |
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Re: Brakes - Wives Tales & Misconceptions
- LATEST CONTRIBUTION AND DISCUSSION - To wit - https://www.fordbarn.com/forum/showt...25#post2180525
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11-11-2022, 04:50 AM | #72 |
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Re: Brakes - Wives Tales & Misconceptions
While I am in B!TCH MODE ...
Read this thread discussing CHI-COM MC's, the origional application and the last post in the thread specifically - To Wit - https://www.vintage-mustang.com/thre...alves.1185634/
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11-18-2022, 07:52 PM | #73 | |
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Re: Brakes - Wives Tales & Misconceptions
Quote:
-ABS BRAKES -
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- AT MY AGE, ONE APPRECIATES A STURDY HANDRAIL - Last edited by KULTULZ; 11-18-2022 at 08:11 PM. |
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11-20-2022, 01:07 PM | #74 |
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Re: Brakes - Wives Tales & Misconceptions
I was having trouble with my brakes on my 56 T-Bird. I got a Disc. Brake kit from Hill's in southern Ohio. Very nice kit all the brake lines come with it. The only thing I had to buy was brake fluid and a brake safety switch. When I remove the old master cylinder it ws suppose to have 4 bolts holding it on. Two bolts just stuck in nothing holding them and the other two finger loose. When I push the brake the master cylinder would push out about a inch. The brake fluid was black in color, not good. No wonder I had a poor brake. I installed the Hill's brake kit and wash out the brake lines with brake clean and air pressure. Then what type brake fluid ti install. Dot 3,Dot 4 or Dot 5. Well I did install Dot 5. It's purple in color. Several talk against it for different reason and a couple that use it love it. We will see how it will work. My brake peddle seams firm but it snowed here and 23 degrees not good for a road test. Maybe next week and will let you know the results how the brakes work.Thanks for all your advice and help.
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11-21-2022, 10:33 AM | #75 | |
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Re: Brakes - Wives Tales & Misconceptions
Quote:
Does anyone else see the mistake made in the above description or is it me just being overly sensitive?
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11-22-2022, 08:14 PM | #76 | |
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Re: Brakes - Wives Tales & Misconceptions
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11-22-2022, 11:58 PM | #77 |
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Re: Brakes - Wives Tales & Misconceptions
The reference I made in post 62 above was like that. It was many years ago, but the valve was on the frame, and the rod went to the rear axle. A simple beam as I remember, typical for an early FWD vehicle. How well it worked I don’t know, but obviously there would be a difference in rear pressure as the chassis shifted under braking. How well that compensated for dry vs wet I don’t know. Modern antilocks make all that moot.
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11-23-2022, 04:01 AM | #78 | ||
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Re: Brakes - Wives Tales & Misconceptions
Quote:
Quote:
A TRIM-HEIGHT SENSING VALVE is also used on air ride cars so they can be confusted easily.
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01-09-2024, 01:40 PM | #79 |
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Re: Brakes - Wives Tales & Misconceptions
Allow Me To Add This Information Here For Future Reference -
- BRAKE VALVING MISC FACTOIDS - PDV One myth that often pops up during conversations is the misconception that if the spool in the pressure differential valve gets (PDV) pushed off-center due to (for example) a brake line failure, it seals off the bad side, allowing you to still have brake pressure on the good side. This is incorrect! It is merely a warning system. The ends of the spool are turned down to allow brake fluid to pass when it is pushed to one side. If the spool was designed to cut off the brake fluid to the side where the pressure has dropped it would seal the fluid between the master cylinder and the distribution block. This would cause the brake pedal to be rock hard and you would have no brakes at all because the trapped fluid would not give. The dual master cylinder is the safety feature that allows pressure at the good end. There is nothing inside the pressure differential valve to replace when rebuilding except for two special o-rings and a crush washer.
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01-10-2024, 11:41 AM | #80 |
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Re: Brakes - Wives Tales & Misconceptions
Geeeze I have a lot to figure out.
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