Forum:
Hi folks. Newbie to this site & Daihatsus. Have just bought (maybe foolishly!) a 1998 Hijet 1200 diesel van. Seems ok so far except for the brakes. I suspect the servo needs a rebuild, has anyone got any advice on this, eg repair kit or exchange unit? Also what's the current situation on workshop manuals? Any info would be useful thanks.
the man with a van
you want to contact harvey he is the man with a van after all the grief he has had with a high jet if he dont know!! well you get the picture
Hi Jet
Not foolishly, they are great vans and fun as well.
You will probably get a CD manual off Ebay as it seems that the petrol Manuals are like hens teeth.
If you give more details of the problems you are having with the brakes and why you suspect the Servo then I will do some head scratching.
OLDMINIMAN
M J Young
Hijet brake servo
Thanks for the replies. Have found a manual on ebay.
Dodgy brakes symptoms are: pedal travels about half way to floor; considerable effort needed on pedal to get even moderate braking; slight fluid weep on visible part of piston at back of servo/master cylinder. Previous owner noted fluid loss. No obvious leaks or white smoke from exhaust. It's the force needed on the pedal that makes me suspect the servo's doing little or nothing. Anyone know where it gets its vacuum feed from (1.2 diesel)? I haven't spotted an inlet manifold yet!
brake Servo.
If you have a visible leak from the back of the master cylinder then I would suspect this first. Are bubbles rising in the Master cylinder?
The Vacuum normally comes off the inlet manifold and you would need, with difficulty, to trace the pipe back to its source.
However I think that the indications point at the seals on the Master cylinder. Fluid can only get into the servo from that seal. The servo should be fine but any fluid within should be drained off.
To test the servo with the engine off then press the pedal and you will hear the servo hissing until exhausted. Now with the pedal still down start the engine and you will feel the pedal rise up slightly as the servo is re activated. The servo is there to assist your foot pressure but needs a sealed hydraulic system to be effective as in deed your foot does. Both work in conjunction to compress the hydraulic fluid and indoing so move the berake copponets to apply the shoes at the rear and the pads to the front. With an obvious leak it's effect and that of your foot will diminish until all the fluid is expelled through the leak and then no brakes reagardless. In addition as the leak expells fluid on the down stroke it can draw air into the system on it's return strok, worsening the situation.
My suggestions is test the servo as above and watch for small air bubbles in the Master Cylinder. If the test works then change the Master cylinder, bleed the entire system in the sequence described in your new manual and you should have brakes again. You must cure the obvious leak before investigating further. Be also aware that in curing one leak and obtaining normal pressure again you can cause an ailing seal elsewhere in the braking system to fail.
Perhaps Harvey can help on this one as he is a wizzard on the Hijet.
OLDMINIMAN
M J Young
Hijet brake servo
Thanks for this OLDMINIMAN.
Maybe this thread should be moved to the problems area!
I've got the w/shop manual now but sadly the brakes & some other sections are missing! Have done the basic servo tests, think I was wrong with my suspected leak & the p/o just spilt some fluid. Vacuum seems to come from a pump on the back of the engine. Vacuum is present at the servo with the engine running, but doesn't seem very strong, so now going to look at the pump. Anyone know what sort of reading I should get on a vacuum guage at the servo end of the pipe?
Hijet brake servo - fixed!
Managed to fix it yesterday. Had got a s/h servo, tested it on the bench with vacuum - ok. Removed suspect one, same test - ok!! Suspect one has Bosch date label: 2006! New (s/h) one was fitted by now so it stays. When I came to air-line the hose connecting the servo to the solid pipe through the floor, I noticed a blockage in the hose. Pushed it out & found it was the protective plastic dust cap fitted to the vacuum connector on the "2006" servo! Someone had fitted a brand new servo but left the cap on so it could never have worked! So fault found & I've got a nearly new spare servo.