1986 740 NO brakes....

SegaRolow · Post by **SegaRolow** » 20 Dec 2007, 22:58

Hello All.

Can any one help me with this please! 1986 Volvo 740. I have no brakes.
Here is the thing! It is not leaking anything at all. THe brakes are full of Fl.
but I have no brakes. ???? I can not put any more brake Fl in...I did bleed them. Still no brakes? help please....!
THanks....

Kmaniac in California USA · Post by **Kmaniac in California USA** » 21 Dec 2007, 09:25

Please help us help you. Please describe in detail what you mean by "no brakes". Obviously, the car can't stop on it's own, but it would help to know the specific symptoms of this condition. Also, did this just occur on it's own or did this condition start after working on the system? By the way, do you have a service manual?

I will be able to help with a little more information.

SegaRolow · Post by **SegaRolow** » 21 Dec 2007, 13:57

Hello,

The brakes just started to go out little by little. The car was stoping just fine. THen the brake peddle started to go down a bit, then more and then to the floor. It happend over a few days. And now the peddle just goes to the floor. Zip 0 nothing.... And there is no brake FL driping out are anything. It is full of brake FL. No leaks, and when I bleed the brakes. they do not take. Zip Nothing... I thought maybe one of my brake cil was going bad in one of the wheels. but no leaks, no drips. Just no brakes....
And this has got me good! Any help at all... would help.........
I am thinking maybe my power booster????????????/

Dan

Kmaniac in California USA · Post by **Kmaniac in California USA** » 21 Dec 2007, 15:08

I got the picture, now. Your brake pedal started going closer to the floor and now goes right to the floor without any braking action. Plus, there are no external hydraulic leaks and the master cylinder is full of fluid.

This tells me that you have an "internal" fluid leak. This occurs when the seals on the master cylinder piston fail, causing fluid leakage between the two fluid circuits and allowing the pedal to go to the floor. What you need is a new master cylinder.

Your problem is clearly NOT your power booster. If the power booster had failed to boost, the pedal would not go to the floor, the car would still stop, but you would have to stand on the brake pedal with both feet to stop the car (increased pedal effort).

Start by replacing the master cylinder. This would also be a good time to inspect and replace any or all of the calipers, if needed, as well as the brake pads, as needed.

The brake system has two separate brake fluid circuits. Circuit A applies both front calipers and the left rear caliper. Circuit B applies both front calipers and the right rear caliper. This design allows the brakes on three wheels to continue operating in event of a leak and failure of one circuit. This is why you will see two separate fluid lines in each front caliper.

Be sure to get yourself a service manual if you decide to do the work yourself.

Let us know what you find and what you do.

SegaRolow · Post by **SegaRolow** » 21 Dec 2007, 15:28

Hi, WOW!

Thank you for the info, I would of never thought of that... This is something I can fix myself.... I see the new ones are on the high side.
$200.00 up...

I can get a used one a pick a part for a lot less.
Can you tell me what to look for when I look for a used one......
Thanks for the info......

Be welll.
Dan

Kmaniac in California USA · Post by **Kmaniac in California USA** » 21 Dec 2007, 16:11

The following is my own personal endorsement and not necessarily the views of www.matthewsvolvosite.com:

www.rprusa.com

New master cylinders for $69.99 plus tax & shipping.

Good luck!