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Re: Intermittently I need to press harder to get the...
Sounds like your master cylinder is beginning to internally bypass. By releasing and re-applying the pedal you are essentially "pumping" the pedal, to regain pressure. A quick check is to apply moderate pressure to the pedal and hold it. If the pedal begins to sink, replace the master. Also check everything for small leaks that slowly bleed system of fluid and permit air to enter. (especially wheel cylinders and backside of master cyl.)
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If its only when you press the brakes, there may be a vacuum loss in the power brake system. Check the hoses from the manifold to the master cylinder booster or the connection on the booster itself. The hose may be split or the connection loose and leaking air. The booster itself may have a ruptured diaphragm. To check this, start the engine and run for a few minutes. Press the brake pedal and hold in. Turn off the engine. You should feel the brake pedal drop slightly. Remove your foot off the pedal and press the brake pedal a few times. Each time you press it , the pedal should keep dropping slightly and feel harder and harder to press. This will let you know that the booster is working properly.
Pretty normal to not be able to lock the brakes without the assistance of the booster, it'll take a lot of pedal pressure without it. It's also normal for the pedal to feel harder without the booster, this goes for any car/truck with power brakes. Try it with any other car you have and you'll see.
I've worked on several old Cadis but don't recall what year they started using front disc. If it's been changed from drum to disc you'll likely need a different proportioning valve and possibly a different master to get them to work right. Talk to the seller and ask if the brake feel changed when they replaced the master and if they changed any other parts.
yes but up to a point
the brake pedal should move about 1" to take up the pedal free play and then be applied smoothly as you press further
the harder you press the more solid stopping action you will get
that way you can feel the brakes working so that you can adjust the braking action for stopping
there should be no hissing noise that occurs when the brakes are being applied
you say hydro booster which is hydraulic booster but a hissing noise will come from an air leak in a vacuum brake booster which indicates that it needs repalcing
If you replace the wheel cylinders or brake calipers and did not bleed them properly, you most likely have air in the lines, If the rear brakes are drum brakes they need to be adjusted (if taken apart or new parts put on) or the pedal may sink when pressed. 1. If the brake pedal is soft when pressed down, the brake lines have air in them and need bleeding to remove the air. 2. a soft brake pedal can also be a bad master cylinder. Replace the master cylinder if the lines have been bleed correctly but the pedal is still soft or sinking when the pedal is pressed.
HI the problem you are having is with the brake light switch if the switch isnt working then it wont allow you to change the gear.
get someone to check the lights for you have the ignition on and press the brakes and get someone to see if the brake lights come on, if they dont then the brake light switch will need replacing, the switch is located on the back of the brake pedal, its a bit difficult to get to and you have to get on your hands and knees and have a close look at the brake pedal the switch is located at the very top of the pedal and at the back you should see it it will have a couple of wires going to it.
if the brake lights are working then check that the brake lights are on when you try changing the gear you may need to press the brake pedal down a bit harder so the brake light switch works.
let me know if the brake lights are working then ill assist you further if the lights dont work then its the brake light switch that needs replacing.
let me know how you get on or if you need further assistance ok
plz rate this solution as i have a whole page of unrated posts, thanks
The fact that you say it is an intermitant problem makes me think your new master cyl is no good. If it happened all the time , I would suggest bleeding the system , and adjusting (tightening) the rear brakes.
If it is the Master , I would expect you would loose a bit of fluid , but you might not see any because it would be leaking out the end of the master and into the booster unit.
The Brake System Indicator normally comes on when you turn the ignition switch ON (II). It is a reminder to check the parking brake.It comes on and stays lit if you do not fully release the parking brake.If it comes on at any other time, it indicates a problem with the vehicle's brake system. In most cases, the problem is a low fluid level in the brake fluid reservoir. Press lightly on the brake pedal to see if it feels normal. If it does, check the brake fluid level the next time you stop at a service station.
However, if the brake pedal does not feel normal, you should take immediate action. Because of the brake system's dual-circuit design, a problem in one part of the system will still give you braking at two wheels. You will feel the brake pedal go down much farther before the vehicle begins to slow down, and you will have to press harder on the pedal. The distance needed to stop will be much longer.
Hope this helps you.