Övrigt

[volvo142atraktor]

Hej, jag har ett ganska smått irriterande problem. Jag får inget tryck i bromsarna utan att pumpa upp det 511 gånger, luft är omöjligt. Har gjort av med 5 liter vätska. Nya ok runt om och huvudcylindern är ny. Inga läckage nån stans.

Hittade denna "dosa" under bilen, kan det vara något?

[skanke]

Bilden visar bromsreduceringsventilerna. De skall reducera bromstrycket till bakbromsarna. Eftersom mesta bromseffekten skall ligga på frambromsarna. Framförallt förhindra att bakbromsarna låser innan frambromsarna. Tror inte att det är de som orsakar problem.

Viktigt att lufta i rätt ordning annars kan man få hålla på till dödagar. Eftersom det är triangeldelade kretsar på 140-serien är det rätt många nipplar att lufta. Sedan är det enklare att använda en luftningsanordning man skruvar på bromsvätskebehållaren och kopplar till t ex ett däck så att man kan trycksätta systemet. Är mycket enklare jmf med att hålla på och pumpa med pedalen. Dessutom är risken stor att man förstör packningarna i huvudcylindern när man luftar genom att pumpa med pedalen. Och då blir pedalen definitivt svampig och mjuk.

[grayson]

So I did the mazda 929 master cylinder because i thought my master cylinder was on its way out (brakes were a little sub par). Since then Ive been going nuts trying to figure out why I dont have brakes. Here's what ive done -

Bench bled master about 4 times now and took it apart to make sure nothing internaly was messed up. Master is moving fluid and seems to hold pressure.

Took off and cleaned proportioning valve. I got air to go through it, although there was a decent amount of restriction (looks to be spring loaded inside). Fluid passed through it under braking, so I figure its a-ok

Brakes are rebuilt as of a year ago so its not caliper related. And up until now Ive had no real issues.

There are no kinks or leaks in any of the lines or connections.


My problem is, my front brakes are moving fluid but kinda suck under load. My rear brakes are moving absolutely nothing. I mean nothing. When I bled them I was pulling fluid out of them with the speed bleeder, but now I get air. I thought maybe it was clogged up in the splitter thats located towards the diff. Nope, clean. So, with the lines completely disconnected, I hit the brakes. No fluid. In fact, with the back brake lines not even hooked up the pedal still gets stiff! WTF!

Now here's whats even weirder. Obviously something is preventing fluid from getting to the rear brakes. My pedal is doing all sorts of crazyness, no matter how much I bleed it. It has a small amount of resistance up until about 2 inches from the floor, then it gets ROCK HARD. Driving around like this feels like trying to stop an 18 wheeler. The brakes work, but they suck horribly. I can put pressure on the pedal and it'll start stopping, but if i put a lot of pressure the abs locks up right away and kinda pulls to the right for some reason.

My best guess is its the ABS unit thats ******* up. But there's no light on. Could it be jammed? Has anyone ever taken these apart? Should I just elminate it. Buying another one is not an option, even used. I dont have the money. At least not for this kind of problem when my alternative (removing it) is nearly free.

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