Massey Ferguson 698 - brakes

patks

Hello,
There is a soft brake pedal on the tractor,does anyone know about brakes on this or how to bleed them?
There is leveling bolts on the side of both hubs.
Do these work on the hydraulic oil fom back end or are the hubs filled with brake fluid or oil separately.
Any help on how the brakes work would be great.

sandydan

All massey brakes are oil immersed now requiring universal or oil suitable for wet brakes .At a guess Id say your problem is caused by water abortion in fluid if its fluid brake and needs to be renewed as in cars on a regular basis otherwise they become spongy,one thing massey don't use the hydraulic oil for braking system, its a while since i saw a 698 so I have forgotten whether they are fluid or rod like 188 but will check and let you know ,if fluid id think brake slave cyclinders should be mounted on out side front of housing with a small bleed screw near where a pipe is screwed .the 300 series have cylinders in axle which require mineral fluid. The master cylinders for fluid are usually behind brake pedals.
The leveling studs I think are probably oil level check holes for hubs not brakes ?
If not sure get some one with a massey to help rather than make a costly,dangerous mistake or try getting a manual

emaherx

sandydan wrote: »

All massey brakes are oil immersed now requiring universal or oil suitable for wet brakes .At a guess Id say your problem is caused by water abortion in fluid if its fluid brake and needs to be renewed as in cars on a regular basis otherwise they become spongy,one thing massey don't use the hydraulic oil for braking system, its a while since i saw a 698 so I have forgotten whether they are fluid or rod like 188 but will check and let you know ,if fluid id think brake slave cyclinders should be mounted on out side front of housing with a small bleed screw near where a pipe is screwed .the 300 series have cylinders in axle which require mineral fluid. The master cylinders for fluid are usually behind brake pedals.
The leveling studs I think are probably oil level check holes for hubs not brakes ?
If not sure get some one with a massey to help rather than make a costly,dangerous mistake or try getting a manual

External slave cylinders, bleed screws can be reached from standing behind tractor. Dot 4 fluid required.

Resivour is under bonnet behind pedal on top of master cylinder.

There is adjusting nuts for leveling the brakes in front of slave cylinders.

Jack both rear wheels off the ground. Thighten the two adjusting nuts until you cant turn the wheels, then back off until they just turn freely.

Then bleed system as normal. Cylinder rebuild kit may be required.

Incidently some 300 series also have external slaves.

sandydan

emaherx you are right , but I had earlier black cab model that had inside slave cylinder, even though dealer tried to convince me otherwise until i took it to him to fit the o rings, nearly got black eye removing them from axle,while lying under it, hate the way they spare the bolts, each one seems to hold on two or three items especially at left side.
Where is rear axle oil filling point? is it like 399 ,with pipe up left front of cab?

btw I would not adjust brakes before bleeding them if wheels are pulling evenly if there is not much travel in pedals

emaherx

It must be be one of the very last of those black cab models.

Agreed on the internal type, I did some last year there was some swearing done especially when the adjusting rod snapped on me as I tried to loosen the nut. Getting the new one on was fun.

sandydan

agree about that .
a good steam power washing is a must and penetrating oil and working nuts back and forward a few threads at a time first. did you see on u tube where some came up with mix using acetone and hydraulic fluid as penetrating oil mix.

it was 88 mf 390 4wd blck cab

FrostyKK

Hi all,
I'm new here and looking for help . We .have a MF 4235 and its lost all brake fluid. I'm assuming I have a slave cylinder seal gone. Are the cylinders accessible externally on this model. It all seems difficult to get at? Even to verify which side is gone, if I refill with mineral fluid (LHM) where can i bleed. Would there be a bleed screw on the trailer brake valve that might be more accessible?

Also is it possible to get seal kits or am i looking at a new cylinder?

Regards and thanks in advance for any help

sandydan

pity you didn't post as new thread some one would have spotted it quicker

tomwaterford

FrostyKK wrote: »

Hi all,
I'm new here and looking for help . We .have a MF 4235 and its lost all brake fluid. I'm assuming I have a slave cylinder seal gone. Are the cylinders accessible externally on this model. It all seems difficult to get at? Even to verify which side is gone, if I refill with mineral fluid (LHM) where can i bleed. Would there be a bleed screw on the trailer brake valve that might be more accessible?

Also is it possible to get seal kits or am i looking at a new cylinder?

Regards and thanks in advance for any help

AFAIK...I think they are internal of the half axle....bleed point on top of axle....very rare for them to go

sandydan

if the system is similar to 300 series they are in rear axle with brake fluid leaking into axle,easily fixed once ripped, just an o ring on 2 small pistons, trouble in 300 series is at least two items hang on every bolt making dismantling and refitting biggest job.nearly got black eye removing one cylinder while lying under axle as pistons fall out when removing.
but i haven't seen 4235 braking system,so apart from that, can't help,sorry

kipkasper09

having a problem with our 698t!! right hand brake is binding she went low on fluid and replaced seals in master cylinder was wondering if anybody else had ever experienced this problem or could help me out thank you

emaherx

kipkasper09 wrote: »

having a problem with our 698t!! right hand brake is binding she went low on fluid and replaced seals in master cylinder was wondering if anybody else had ever experienced this problem or could help me out thank you

I have seen the slave cylinders on these seize. Has the tractor been lying up for a while?

kipkasper09

it would lie up for periods of time is it a case of removing slave cylinder and cleaning or a new kit on that side cheers

emaherx

kipkasper09 wrote: »

it would lie up for periods of time is it a case of removing slave cylinder and cleaning or a new kit on that side cheers

Take it off and look at it. Check that everything else is moving freely. You can bench test the cylinder with an air line. The big rubber seal at the end is just to keep water out, if it is torn that will be your issue.

I am of coarse assuming you haven't adjusted the breaks at the Axel recently.

kipkasper09

no havent done nothing with them will be monday before i get at it now thanks will post here to see how i got on cheers

emaherx

Complete cylinder from agriline is not much more expensive than the seal kit. But test yours first.

http://www.agrilineproducts.com/Catalogue/NavigateProduct/5984-brake-slave-cylinder?categoryId=massey-ferguson-698

Could also be a sticking handbrake cable, just disconnect it from that side to test.

There is always the possibility of something inside the Axel sticking or even a warped disk. But I would be more inclined to believe it's external parts as tractor lies idle at times and internal parts are oil emersed.

kipkasper09

when i was drawing bales out to the farm over the winter there did come a kinda clunking noise in the back axel you could hear it everytime the wheel done a revolution ..heard that it could be the pinion too

emaherx

kipkasper09 wrote: »

when i was drawing bales out to the farm over the winter there did come a kinda clunking noise in the back axel you could hear it everytime the wheel done a revolution ..heard that it could be the pinion too

That might be an issue alright. Has that stopped now?

kipkasper09

dont know as i'm goin to take off the slave cylinder go from there i will post my findings there was no spring on that pedal up in the cab and it would stick down too so it could be the thing is siezed up

emaherx

kipkasper09 wrote: »

dont know as i'm goin to take off the slave cylinder go from there i will post my findings there was no spring on that pedal up in the cab and it would stick down too so it could be the thing is siezed up

No spring on the pedal shouldn't cause binding as there should be return spring on the axle too. Spring on pedal ensures correct operation of break lights. But as pedals should be locked together most of the time one spring would be ok.

howyenow

I have a 698 massey with a leak which seems to be coming out of the brake rod housing just above the slave cylinder on the right hand side. It seems to come about when the brake is pressed. Also, once overfilled the yoke with backend oil and it literally poured out of that spot. Is there a seal there that needs replacing and is it a big job?

emaherx

howyenow wrote: »

I have a 698 massey with a leak which seems to be coming out of the brake rod housing just above the slave cylinder on the right hand side. It seems to come about when the brake is pressed. Also, once overfilled the yoke with backend oil and it literally poured out of that spot. Is there a seal there that needs replacing and is it a big job?

Yes, there is a rubber boots seal between slave cylinder and brake actuator. Not a big job but slave cylinder needs to be taken off so brakes will need readjusting afterwards.