My 87 vert is leaking brake fluid out of the pressure sending device! This sensor is attached at the master cylinder and connected to wire that gives the warning light on the dash.

On the device there is a hole between the two protruding electrodes that connect to the wire. The dealer assures me the hole is supposed to be there. My brake fluid leaks out freely, the light on the dash comes on indicating no brake fluid and the pedal indicates this is true as well.

The connecting wire is seated in a rubber boot. Could this be designed to plug the hole? The boot is badly worn??

Thanks for any ideas!

 

I have never heard of a pressure switch leaking.

I would replace the switch. They are not all that expensive.

 

I had this exact problem. Got a rebuilt master cyl. It was leaking like you say from day 1. Not too bad at first but got worse and worse. Finally I went to the dealership and bought the little white switch you are talking about and it did not help. There was an internal leak in the MS and fluid just happens to leak from this hole. You can try to replace the switch but I think you will be wasting your $. Let us know how it turns out.
Harold

 

You need a new mastercylinder or rebuild the one you have. Your mastercylinder is leaking internally on the sealing rings of the front to rear pressure piston.

 

Sensor is not leaking.....when fluid gets to the sensor it should set off the warning light in the dash to alert you that the master cyl is leaking and needs to be rebuilt/replaced. The sensor is not meant to hold pressure or brake fluid.

 

Sounds like a new master cylinder to me! I did try to replace the switch-continued to leak. What you say makes perfect sense.

Many thanks!

 

hi i have been reading posts on here for a year just actully created acount anyway i had same problem on my 87 convertable vette i bought brand new in 87 started having problems with the brakes without warning brake pedal would go to the floor no brakes scary took to the dealer four time first time they put more brake fluid in 2 time same thing it keep doing it my friend was looking under the hood after that when it did it again it was shooting up out of that sensore on top of master when i pushed on the brake pedal took it back they replaced the sensore a week later same thing they ended up puting in a new master cylender anyway if you look up recales for that year vette that sensore is a recall item but they still have the recalled sensores sitting on the shelf at dealer be carfull a week after the new master dealer installed i was driving down town without warning no brakes the light turned yellow i was already going 45 mph so i punched it to get throgh it was either that or crash into cars when they started going any way could not stop pedestrians crossing street up ahead so i pulled the emergency brake and i put the car into 5 parked cars and a big oak tree dang near killed me totaled car went to court to sue dealer gus poulos there lawer called it comparitve neglegents becuase i had punched it to get through light i was going fast so i never got what i should have for there shodiy mechanics job oh well that part is a recall get a good one and be carfull after you put it in make sure it is not spraying out of it again